<About ImgFun : An image compression and enhancement program                written by C.C. Hsu. All rights reserved.                                                                About Help: Help is activated by pressing F1 in the menu                mode. Please use the following keys in help:                    Page Up, Page Down: previous page, next page                Esc   : exit help                                           Space bar: help topic selection list                                                                                For the topic selection  list, you can use Up,              Down, Page Up, and Page Down to scroll for the              topic or type in the name of the topic to select            the topic you want. After a  topic is selected,             press Enter, then the contents of the help topic            will be displayed in this window. Use Esc to                exit the help topic selection.                                                                               Please read register.txt and register to support ImgFun.    Press Page Down:for MAIN MENU                               other topics related: PRESS SPACE BAR FOR TOPICS AVAILABLE!Main menu: In the main menu, you can use arrow keys or type            in the capitalized letter for selecting the                 function.  Each pull down menu  contains a                  function list. Please enter the capitalized                 letter or Up, Down keys for selecting functions.            The  function   may ask for parameters or                   selections  from lists to do the work. A function           key menu bar and a status box are also displayed            in the lower part of the screen.                                                                               menus                 functions                                                                                         File:     View, Load, Save, Quit                            Adjust:   Brighten, Darken, Color, conTrast                 Set:      Background, Cut area, Directions, Threshold       Transform:Rescale, Smooth, shArpen, rOtate,                 Options:  Display, direcTory, dIther                        Utility:  Compress, cOnvert, sLide show                                                                                Press Page Down for: FILE menu     Page Up: ABOUT HELP     File menu:                                                                                                                View: view an image file from the image directory           Load: load an image file into ImgFun                        Save: save the loaded image 1 into a disk file              Quit: quit ImgFun                                                                                                      Several image formats are supported by ImgFun.              Please see FORMAT, COMPRESS, and CONVERT for more details.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Press Page Down for: VIEW     Page Up for: MAIN menu        other topics related: FORMAT, CONVERT, COMPRESS            View:                                                                                                                     View an image file from the image directory which can be    set from Options, Directory, Image in the main menu.        Formats supported will be listed. ImgFun uses the file      extension to distinguish different formats. Files with      chosen format extension will be listed. You can type the    name of the file or use,  Up, Down, Page Down, and Page     Up to scroll for the file you want to view. After the       file is chosen, just press Enter. Then the  file  will      be decoded and output to the screen center adjusted.        The View function does not create disk files.  You can      view images from a floppy disk without copying files to     the hard disk. The screen resolution can be set from        Options, Display, mode. FOR THE 1024x768 MODE, PLEASE       MAKE SURE, YOUR MONITOR CAN STAND IT, OTHERWISE YOU         MIGHT DAMAGE YOUR MONITOR!!!                                                                                           Press Page Down for: LOAD,    Press Page  Up for: FILE menu other topics related: FORMATS, SHOW, OPTIONS menu          Load:                                                                                                                     Load an image file into ImgFun. Please select the format    from the image format list, then a file selection  list     which contains the files with the appropriate extension     in the image directory will appear. Type in the file        name or use Up, Down, Page Up, Page Down to scroll for      the file you want to load in. Press Enter for the image     file, then ImgFun will begin to load the file. After the    file is loaded, the status box in the lower part of the     screen  will contain information about the loaded image.    The loaded file(s) are stored in the current directory.     Up to two files can be loaded at the same time. If an-      other image is loaded, the loaded image 2 will be pushed    out of the stack. All processings are done in the loaded    image 1. After the image is loaded, use SHOW to view the    image by pressing F5.                                      Press Page Down for: SAVE, Page Up for: VIEW                other topics related: SHOW, SWAP, FORMAT, UPDATE, UNDO,SAVE ADJUST MENU, SET MENU, UTILITY MENU                        Save:                                                                                                                     Save the loaded image 1 in an image file. Choose the        format and enter the file name for the output file,  then   ImgFun will save the loaded image in the file. If noth-     ing  went wrong, ImgFun will report the saved file size.    Otherwise  an error message box will appear. For JPEG       format, ImgFun will ask about the compression level to      save the image. For  most images a compression level of     5 to 7 will be good enough.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Press Page Down for: QUIT, Page Up for: LOAD                other topics related: FORMATS, JPEG, CONVERT, COMPRESS     Quit:                                                                                                                     Quit ImgFun. PLEASE MAKE SURE YOU HAVE THE LOADED IMAGES    SAVED PROPERLY,  OTHERWISE THE LOADED IMAGES will BE        DISCARDED!!!                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Press Page Down for: ADJUST MENU, Page Up for:  SAVE        other topics related: SAVE, LOAD                           Adjust Menu:                                                                                                              Brighten: increase the brightness of the image              Darken  : decrease the brightness of the image              Color   : adjust the colors of the image                    conTrast: adjust the contrast of the image by gray level              remapping                                         All the adjustments are performed on the loaded image 1.    If any adjustment is applied, the Update indicator in the   status box will become N.                                                                                               If you don't like the result, you can UNDO the adjustments  by pressing F2. Or update to accept changes. All the ad-    justments  here only alter  the color table of the loaded   image 1. No new file is created for the adjusted image.                                                                                                                                                                                        Press Page Down for: BRIGHTEN,         Page Up:QUIT         other topics related: UNDO, UPDATE, STATUS                 Brighten:                                                                                                                 Increase the brightness  of the loaded image 1 to make the  image brighter.                                             All colors of the loaded image 1 are added the amount       entered by the user in the luminance.                       The result is shown immediately.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Press Page Down for: DARKEN,  Page Up for:ADJUST menu       other topics related: DARKEN, UNDO, UPDATE, SHOW           Darken:                                                                                                                   Decrease the brightness of the loaded image 1 to make       the image darker.                                           The amount entered by the user is subtracted from the       luminance of all the colors in the image.                   The result is shown immediately.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Press Page Down for:COLOR,    Page Up for:BRIGHTEN          other topics related: BRIGHTEN, UNDO, UPDATE, SHOW         Color:                                                                                                                    RGB: Adjust colors of the loaded image 1 in  red, green,      and blue components.                                        The amounts of adjustment are added into the red, green     and blue components of all the colors of the image.         The result is shown immediately.                                                                                      PSEUDO: Use gray level to produce a new color palette.                                                                    The user has to set 4 parameters. The period, p, the        shift amounts for red, green and blue components, sr, sg    and sb. This function is implemented for amusement and      producing images with special effects.                      The user can use this function to pseudo color a gray       image.                                                                                                                                                                           Press Page Down for: CONTRAST, Page Up for: DARKEN          other topics related: ADJUST MENU, UNDO, UPDATE            Contrast:                                                                                                                 Adjust the colors of the loaded image 1 by gray level       remapping.                                                  ImgFun will ask for the old range [a,b] and new range       [c,d].                                                      Colors in gray level [0,a]  are remapped to [0,c],                               [a,b]  remapped     to [c,d], and                           [b,255] remapped    to [d,255] by      linear mapping in the gray level.                           For example:                                                  Dark region  stretch: [a,b]=[0,60], [c,d]=[0,100]           Bright region  stretch:[a,b]=[200,255]                                             [c,d]=[160,255]                      Mid-range stretch: [a,b]=[120,200], [c,d]=[90,230]        The result is shown immediately.                                                                                                                                                   Press Page Down for: UNDO, Page Up for: COLOR               other topics related: ADJUST MENU, UNDO, UPDATE            Undo:(F2)                                                                                                                 Undo all the changes made to the loaded image 1, since      the last time you update the image.                         Please see also UPDATE.                                                                                                 The update status is indicated in the status box with:      UPDATE ? Y: if the image is updated,                        UPDATE ? N: changes are made since last update.             For some operations, ImgFun will perform on updated         images only.                                                The result image is shown immediately.                                                                                                                                                                                                                                                                                                                                                                                             Press Page Down for: UPDATE          Page Up for: CONTRAST  other topics related: ADJUST, TRANSFORM, SET menus, SHOW   Update:(F4)                                                                                                               Update all the changes since the last update of the loaded  image 1. See also UNDO.                                     The update status is displayed in the status box with:      UPDATE ? Y: The current image is an updated image!          UPDATE ? N: The current image is not updated yet!           The result image is shown immediately.                                                                                  The update function saves the current status of the loaded  image 1. Changes after the last update can be removed by    the undo function which just restores all the settings and  the palette saved in the last update.                                                                                                                                                                                                                                                                                                                                  Press Page Down for: SWAP,   Page Up for: UNDO              other topics related:UNDO, ADJUST, SET, TRANSFORM menus    Swap:(F3)                                                                                                                 Swap the loaded image 1 to the loaded image 2, and the      loaded image 2 to the loaded image 1.  The loaded image     1 must be updated.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Press Page Down for: SHOW      Page Up: UPDATE              other topics related:LOAD, UNDO, UPDATE, SHOW              Show:(F5)                                                                                                                 Show the loaded image 1. The following keys are used in     the show mode:                                                to zoom in and out: Page Up, Page Down. Zoom up to 4                            times in width and height.              to scroll: Up, Down, Left, Right.                           to adjust step size  :  '+' to increase step size                                   '-' to decrease step size           back to the menu mode: any key other than above                                                                       The screen resolution can be set by Options, Display,       Mode in the main menu.                                      The left upper corner can be set by Options, Display,       Xmin, Ymin in the main menu.                                Directions and the background of the image can be set       from the set menu.                                          FOR 1024x768 MODE, MAKE SURE YOUR MONITOR CAN STAND IT!    Press Page Down for: GRAY        Page Up for: SWAP          other topics related: LOAD, OPTION, SET and TRANSFORM menusGray:(F6)                                                                                                                 Turn the loaded image 1 into a gray image. Since it is      much faster to compress, decompress and process gray        images,  thus,  it  is highly recommended to turn the       image into gray, if the image is used for applications      mainly without colors like non-color desk top publish-      ing, non-color print out, and etc..                         You can undo the function by pressing F2 and to accept      F4, (update).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Press Page Down for: DOS,     Page Up for: SHOW             other topics related: UPDATE, UNDO, SHOW, LOAD             DOS:                                                                                                                      Shell out to DOS. Remember to type 'EXIT' to come back      to ImgFun!  Since ImgFun resides in the memory, you         might not be able to run another big program.                                                                           You can start ImgFun in a DOS prompt under MS-Windows in    the full screen mode. After the main menu appears, you      can press Alt-Tab to switch between ImgFun and Windows.                                                               WARNING:                                                      Running ImgFun in a window under Windows with other         Windows application might produce unpredictable results     if they contend for the video memory.                       For the safety reason, always  run ImgFun in the full       screen mode and use Alt-Tab to switch between ImgFun        and Windows.                                                                                                           Press Page Down for: SET MENU, Page Up for: GRAY            other topics related:                                      Set menu:                                                                                                                 Background: set the background color                        Cut area  : set a cut area                                  Directions: set horizontal and vertical directions          Threshold : set a threshold  value to view a  binary                    image, mainly for showing the gray level                    distribution. Nothing is altered.               All the functions are acted on the loaded image 1.          These functions change  internal flags of the loaded        image 1. The UNDO and UPDATE mechanism works with these     functions, too. Nevertheless, these settings can be         changed and restored at any time you want.                                                                                                                                                                                                                                                                                                                             Press Page Down for:  BACKGROUND, Page Up for: DOS          other topics related:UNDO, UPDATE, ADJUST, TRANSFORM menus Background:                                                                                                               Set the background of the image to a desired color          [red, green, blue].  The nearest color available will       be chosen.  The color chosen by ImgFun may not be           satisfied.  You can reset the color or undo the func-       tion.                                                                                                                   The result is shown immediately.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Press Page Down for: CUT AREA,  Page Up for: SET MENU       other topics related: UNDO, UPDATE                         Cut area:                                                                                                                 Set a cut area for display and processing.                  For an image w by h, the pixels of the image are            addressed as (x,y), x from 0 to w-1, y from 0 to h-1.       The X direction is left to right.  The Y direction is       top down. A  cut area is specified by the left upper        corner (x1,y1) and bottom right corner (x2,y2).                                                                         This function only changes  internal variables about        the loaded image 1. Thus you can undo the function and      try for the cut area  you want.                             The result is shown immediately.                                                                                                                                                                                                                                                                                                                                       Press Page Down for: DIRECTIONS  Page Up for: BACKGROUND    other topics related: SET, TRANSFORM menus, UNDO, UPDATE   Directions:                                                                                                               Set the viewing directions of the loaded image 1. The       Default settings are top down and left to right. For        formats storing images other than the default directions    , ImgFun will automatically convert the image in top        down and left to right directions when loading images.      Set direction bottom  up has the same effect  as revers-    ing  the image, and set direction right to left is the      same as mirroring the image.  Undo and update work with     this function, too. The current settings are reflected      in the status box.                                                                                                                                                                                                                                                                                                                                                                                                                 Press Page Down for: THRESHOLD,   Page Up for: CUT AREA     other topics related: SET, TRANSFORM menus, UNDO, UPDATE   Threshold:                                                                                                                View a binary image by applying a threshold  to the         gray level of the loaded image 1. The gray level of an      image ranges from 0 to 255 with 0=black and 255=white       for each pixel of the image.                                                                                            With a threshold, T, pixels with gray level less than       T will  become black, others become white. The function     is a view only function that DOES NOT CHANGE anything.      The function is provided mainly for understanding the       gray level distribution of the image.                                                                                                                                                                                                                                                                                                                                                                                              Press Page Down for: OPTIONS menu, Page Up for: DIRECTIONS  other topics related: ADJUST, SET, TRANSFORM menus, GRAY   Options menu:                                                                                                             Display: mode: change the screen display resolution                  card: configure the driver for display                      (xmin,ymin): set left upper corner of display      direcTory: image: directory of images                                  help : directory of the help file                dIther: ON or OFF, use dithering or not when decoding               compressed images and remapping internal true               colors to a palette.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Press Page Down for: DISPLAY,  Page Up for: THRESHOLD       other topics related: FILE menu, FORMATS                   Display: mode                                                                                                             Set the display mode for different resolutions. ImgFun      uses the following modes for displaying images.               320 x 200   256 colors, standard  VGA mode                  640 x 400   256 colors, super VGA mode                      640 x 480   256 colors, super VGA mode needs 512K on VGA    800 x 600   256 colors, super VGA mode needs 512K on VGA   1024 x 768   256 colors, super VGA mode needs 1Mb  on VGA    MAKE SURE YOUR MONITOR CAN STAND THE LAST TWO MODES!!!      Some modes may not be available or working well for         some SVGA cards, please contact the author for technical    support.                                                *card: Configure the SVGA driver for the display card!!!    *(Xmin,Ymin)  is the upper left corner of the display area  in the screen for starting to display images and can be set by the user.                                                                                                             Press Page Down for: CARD         Page Up for: OPTIONS      other topics related:VIEW, SHOW                            Card: Configure the display driver                       1/3                                                              Standard: 320x200x256 color standard mode only. This is               the same as starting the program with -s switch.            command line: imgfun -s                           Auto    : auto detect the card installed (default)          If the auto-detection works well, then just use             it. If any problem encountered, please start ImgFun with    the -s switch.                                                                                                          VESA: Use the valid VESA driver if detected and verified.         DO NOT TRY IT IF AUTO DETECTION WORKS WELL!!          Direct selection of SVGA drivers:                           Just select appropriate SVGA driver by yourself. The SVGA   used can be identified when the machine boots up, or you    can check your VGA manual. For each manufacturer, the most  common one is listed first.                                                                                            Press Page Down for: CARD(2/3)      Page Up for: DISPLAY    other topics related: VIEW, SHOW, DISPLAY                  Card: (continued)                                        2/3                                                                Trident: Trident 89 for Trident 8900 or newer                        Trident 88 for Trident 8800                        Tseng's Lab: ET4000 or ET3000                               Paradise:WD90C11  for WD90C11 or newer                               WD90C10 , WD90C00                                           PVGA  for older cards than above                   ATI:     ATI28800 for ATI18800-2 or newer                            18800-1  for ATI18800-1 only                       Chips and Technology:                                                C&T 453 for 453 or newer                                    C&T 452 for 452 Version 1 only                              C&T 451 for 451, 455, 456 only 320x200x256         Genoa:   GVGA for anything other than Genoa 5000                     Genoa 5000  for Genoa 5000 only                    Video7:  V7VGA4 for ver. 4 or  newer, faster than v.1-3              V7VGA1-3 for version 1-3                                                                                    Press Page Down for: CARD(3/3)         Page Up: CARD(1/3)  Card: (continued)                                        3/3                                                              SVGA chips listed are the most popular ones on the          market. If the auto-detection reports only  standard        320x200 available, then try to install a VESA driver        and test the VESA driver can be accepted or not.            If there's any problem with the auto-detection function,    then manual setting with a proper driver must be            employed for SVGA modes. If you are sure there's a problem  with any of the SVGA drivers listed,   please                                                                           DO INFORM THE AUTHOR.                                                                                                   For users who are confused about choosing a proper drive    , please contact the author for assistance.                                                                                                                                                                                                    Press Page Down for: DIRECTORY    Page Up for: CARD(2/3)    other topics related:DISPLAY, VIEW, SHOW                   Directory:                                                                                                                  image : the directory of source images for ImgFun to                work with.                                                                                                      help  : the directory that imgfun.hlp resides                                                                         You can start ImgFun from any directory  , but please       specify the help directory for the help system to work.     Since ImgFun uses files for storing images, a fast disk     caching program will help ImgFun a lot.                     You can even view images from floppy disks  without copy-   ing  the files to your hard disk, as long as you specify    the right image directory.                                  All the temporary files ImgFun opens are in the directory   you start ImgFun under DOS. Please RETURN to the same       DIRECTORY YOU START IMGFUN, if you use the dos shell.                                                                  Press Page Down for: DITHER   Page Up for: CARD(3/3)        other topics related: FILE menu                            Dither:                                                                                                                   Use dithering or not in decoding    JPEG images into        256 color mapped images , smoothing and sharpening          images. In most cases, dithered result is better for        viewing. But sometimes, dithered result may be too          noisy( some undesired spots). The user can set the          dither on or off to see which one is better.                The default setting is dither off for faster response.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 Press Page Down for:TRANSFORM menu, Page Up for:DIRECTORY   other topics related: JPEG, TRANSFORM menu                 Transform menu:                                                                                                           Rescale: rescale the loaded image 1 to new width and                 height                                             Smooth : smooth the loaded image 1 in the gray level        shArpen: sharpen the loaded image 1 in the gray level       rOtate : rotate the loaded image 1 in 90, 180, 270                   degrees counter-clockwise                                                                                      Functions in the transform menu require the loaded image 1  to be an UPDATED image. A new image is produced by   the    selected function and becomes the loaded image 1. The old   loaded image 1 becomes the loaded image 2. The old loaded   image 2 will be discarded.                                                                                                                                                                                                                                                                                 Press Page Down for: RESCALE      Page Up for:DITHER        other topics related:  FILE, ADJUST, SET, LOAD, UNDO,UPDATERescale:                                                      Rescale the loaded image 1 to the new width and height.     ImgFun allows the new width and new height to be 25% to     400% of the old width and height respectively, also the     new width and height should not exceed the system limit     of the largest width and height allowed in ImgFun.          If the new width or height is within 25% to 150% of the     old value , ImgFun uses the zero-order, nearest             neighbor, interpolation for the rescaling, otherwise the    first order linear interpolation is used. For gray level    images, ImgFun just interpolates the gray level for each    pixel in the new image. For color mapped images, ImgFun     interpolates in the luminance (gray level) and the          chrominance components of the image, then remapps each      pixel into the color table entry to produce a color         mapped image with the original palette. This is why it      is slow for rescaling to large images.      The rescaled    image may lose  some image quality due to the process.     Press Page Down for: SMOOTH       Page Up for: TRANSFORM    other topics related:TRANSFORM, SET, ADJUST menus, SHOW    Smooth:                                                                                                                   Smooth the loaded image 1 in the luminance (gray level)     component. If the loaded image 1  is a color mapped         image, ImgFun will map each pixel of the smoothed image     to the original color map entry to produce a new color      mapped image. The function is mainly for noise reduction    and only works on an updated image. The function            produces a new smoothed image as the loaded image 1. The    old loaded image 1 becomes the loaded image 2.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Press Page Down for: SHARPEN, Page Up for: RESCALE          other topics related: TRANSFORM, ADJUST, SET menus,        Sharpen:                                                                                                                  Sharpen the loaded image 1 in the luminance (gray level)    component. This function is not the inverse of the          smooth function. The sharpened image will contain more      high frequency components. The edges of the image are       intensified. This may be useful for printing  the image.    The function works on an updated image only. The result     image replaces the loaded image 1, and the old loaded       image 1 becomes the loaded image 2.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Press Page Down for: ROTATE     Page Up for: SMOOTH         other topics related:TRANSFORM, SET, ADJUST menus, SMOOTH  Rotate:                                                                                                                   Rotate the image counter-clockwise  by 90, 180, or 270      degrees. A new image will be produced from the loaded       image 1. The function works on an updated image only.       The result image replaces the loaded image 1 and the old    loaded image 1 becomes the loaded image 2. Basically,       this function just changes the location of each pixel in    the old image. See also DIRECTIONS for producing a          reversed or mirrored image.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Press Page Down for: UTILITY menu    Page Up for:SHARPEN    other topics related:OPTION menu, DIRECTIONS               Utility menu:                                                                                                             Compress: compress an image by JPEG compression             cOnvert : convert images between different formats          sLide   : display image files as a manual slide show                                                                    Please see FORMATS for formats supported.                   Functions here usually require the user  to supply image    file names.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Press Page Down for: COMPRESS    Page Up for:ROTATE         other topics related: FORMATS, VIEW, SHOW                  Compress:                                                                                                                 Compress an image from the image directory which can be     set by Options, direcTory, IMAGE in the main menu.          ImgFun uses JPEG compression for image compression.         ImgFun will ask the user for the compression level.                                                                       For most images,   a compression level between 5 to 7     is suggested for 256 color mapped images. A higher level    can be set for gray level images. ImgFun will tag the       color table into  the compressed image for use in de-       compression. You can use the convert or load function to    decompress a compressed image.                                                                                                                                                                                                                                                                                                                                         Press Page Down for:CONVERT   Press Page Up for:UTILITY     other topics related:FORMATS, JPEG, LOAD, CONVERT          Convert:                                                                                                                  Convert an image from one format to another format, also    decompress a JPEG compressed image into other  formats.     Formats under support will be listed. The user has to       choose the source and destination formats which should      be different. The function DITHER ON or OFF in the          option menu does affect  the JPEG decompressed results.     Please see the topic, DITHER for more information.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Press Page Down for: SLIDE SHOW,  Page Up for:COMPRESS      other topics related: FORMATS, JPEG, COMPRESS, LOAD, DITHERSlide show                                                                                                                To display images as a manual slide show. ImgFun will       ask the file name of the slide file name file. The slide    file name file is a text file which contains file names     with full paths of images to be displayed. Each line of     of the slide file name file should contain only one image   file name from the beginning of each line. The slide file   name file can be easily produced from a text editor.        For the slide show, you can use the up arrow key for the    previous image, ESC to abort, and any other key for the     next images. The display resolution can be set from         Options, Display, mode in the main menu. Images will be     displayed center adjusted in the screen.                                                                                                                                                                                                                                                                   Press Page Down for:STATUS BOX, Page Up for:CONVERT         other topics related: FILE menu, LOAD, SHOW, VIEW          Status box:                                                                                                               A status box is displayed in the lower part of the          screen for information about the loaded image 1 and         the loaded image 2. The UPDATE ? Y(N) flag in the right     upper corner of the status box  indicates any change        has been made since the last update. Other information      about the current settings of the loaded image 1 is         displayed in the box.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Press Page Down for: FORMATS, Page Up for: SLIDE SHOW       other topics related: SET menu, UPDATE, UNDO               Formats:                                                                                                                  formats supported      compression method                                                                               GIF:                 12 bit LZW encode                      PCX:                 8 bit run length encode                BMP:                 no compression                         JPEG:                8 by 8 DCT, Huffman encode                                                                       If you like some format to be supported by ImgFun, please   contact the author, since this is a user-supported program.                                                                                                                                                                                                                                                                                                                                                                                                                                      Press Page Down for: GIF,       Page Up for: STATUS BOX     other topics related: LOAD, SAVE, COMPRESS, CONVERT        GIF:                                                                                                                      CompuServe's Graphical Interchange Format.                  The GIF format uses 12 bit LZW compression for storing      color mapped images. A color mapped image  is an image      with 256 or fewer different colors. All the different       colors are stored in a palette and each pixel of the        image is stored as an index into the palette. Turning a     true color image into a color mapped image is a lossy       and slow process.                                           The LZW algorithm has a compression ratio around 1.2 to     2.     A GIF encoded image  has a compression ratio         about 4 to 6 comparing with the original 24 bit true        color image. For gray images with 256 levels or fewer,      the GIF format can store the image faithfully with a        compression ratio 1.2 to 2.                                 The GIF format is recommended for frequently used images    , since LZW encode and decode are fair in speed.           Press Page Down for:PCX      Page Up for:FORMATS            other topics related: FORMATS, JPEG                        PCX:                                                                                                                      PCX is ZSoft's PC PaintBrush format. ImgFun supports PCX    version 2.8, and 3.0 color mapped images up to 256          entries in the image palette.                               PCX uses  8 bit run length encode or no compression for     storing images. Basically, PCX stores the same kind of      images as GIF format. The run length encode is faster in    encoding and decoding than the LZW method in GIF but        poorer performance in compression. ImgFun supports PCX      , since PCX is widely used in the PC world. PCX is re-      commended for images requiring fast access.                                                                                                                                                                                                                                                                                                                                                                                        Press Page Down for:BMP   Page Up for:GIF                   other topics related:FORMATS, GIF                          BMP:                                                                                                                      BMP is MicroSoft's bit map format. ImgFun supports Micro-   soft's Device Independent Format under MicroSoft  Windows   3.0 and 3.1. The BMP format can be used for color mapped    images and 24 bit true color images. Currently, ImgFun      only supports uncompressed color mapped BMP files. Since    these are images mostly used under Windows.   The BMP       images are not compressed, thus can be used for comparing   compression ratios obtained by other formats.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Press Page Down for: JPEG     Page Up for:PCX               other topics related: FORMATS                              JPEG:(.jpg)                                              1/3  JPEG( Joint Photo Experts Group) is an image compression    mechanism that uses  8 by 8 discrete cosine transform       coding and entropy coding  by run length encode and         varied length Huffman coding or arithmetic  coding.         Currently, ImgFun supports JPEG format  in Y,U,V 2:1:1      subsampling in horizontal and vertical directions and       interleaved one scan images for one pass decode and         encode. JPEG is designed for varied level compression       of true color images.                                                                                                   For most color mapped images a compression level of 5 to    7 is recommended in JPEG compression.  For gray level       images, a higher compression level can be set. If the       compressed image is not satisfied, you can lower the        compression level for better image quality. Or you can      try higher  compression levels for better compression.      JPEG compressed images are true color images in the                                                                    Press Page Down to Continue                                JPEG(continued)                                          2/3  Y,U,V color space. ImgFun tags the palette  of the color    mapped image  into the header of the compressed file for    decompressing compressed images into color mapped images    required by other formats. This involves mapping each       pixel of the image into the palette entries. The process    is time-consuming and noisy. This is the price paid for     the color-map display system.                                                                                           For color mapped images with less than  32 color entries    or gray level images with less than 16 levels, ImgFun       will refuse to compress the images. These images are        better compressed in the GIF format, since JPEG is          designed for continuous tone images.                                                                                    For gray level images, it is highly recommended to save     the image by JPEG compression. A compression ratio of 10    or above is easily achieved without visual degradation                                                                 Press Page Down to continue                                JPEG(continued):                                         3/3  for gray level images in JPEG compression. For color        mapped images in GIF, a compression ratio of 3 to 7 can     be obtained from JPEG compression. Thus it is highly        recommended to save images in JPEG format for storing       a large archive of images.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             other topics related: FORMATS, DITHER, COMPRESS, CONVERT   