(logo)  AWeb JFIF plugin

General

The awebjfif plugin for AWeb allows you to view all JFIF images. Features include:

Installation

Follow these steps to install the AWeb JFIF plugin.
  1. Run the supplied Installer script. It will copy the necessary files to a drawer awebplugins in the drawer where the AWeb-II program is located.

    The installer script might ask you for a location to store temporary swap files during decoding of large images. You should select a drawer on your hard disk.

  2. Run the .

Manual Installation

If, for some reason, you don't want to install the plugin automatically, you can install it by hand.
  1. Copy the file named awebjfif.awebplugin to a location of your choice. The recommended location for plugins like this is a drawer awebplugins in the drawer where the AWeb-II program is located.

  2. Select a drawer on your hard disk for the temporary swap files. These files may be needed during decoding of large images. Add the following assign to your S:User-Startup file if it isn't already there:
    assign JPEGTMP: swap_drawer
    where swap_drawer is the drawer you selected.

  3. Start AWeb-II, open the browser settings and bring up the Viewers page. Select the entry for MIME type IMAGE/JFIF and change the following settings:

  4. Don't forget to save your settings.

Parameters

The awebjfif plugin supports two optional parameters. You can type the chosen parameters in the "Arguments:" field of the settings window. Separate the parameters by a comma or space, if you specify more than one.
PROGRESS=0|number
Specifies the number of image scan lines to decode before the display is updated. A higher number is faster but results in chunkier building of the image. PROGRESS=1 gives the smoothest progressive display but is relatively slow. The default value is 4, which is a good compromise between speed and visual attractiveness.

If you specify PROGRESS=0, progressive display is disabled. The image is not displayed until decoding is ready.

DITHER=0|1|2
A number specifying the dither mode if colourmapped images are generated. This option takes only effect on screens with 256 colours or less. On CyberGraphics screens with more than 256 colours, true colour images are produced and no dithering is performed.

The number specifies the type of dithering as follows:
numberdither mode
0No dithering (fast but low quality)
1Ordered (compromise between no dithering and Floyd-Steinberg)
2Floyd-Steinberg (best quality but slow). This is the default.

GRAYSCALE
Produce grayscale images. This is faster than colour images.

MAXMEM=number
Specifies the maximum amount of scratch memory (in kB) to be used for the decoding process of each image. Large images may take quite a lot of memory during decoding. If an image needs more memory than the specified maximum, a virtual memory system is used. After the image has been decoded, the scratch memory is released, even if the image is still displayed.

Default for this parameter is 1024 (= 1 megabyte). Note that the maximum is used on a per-image basis, not for all images together.

Support

The AWeb JFIF plugin was written by the author of AWeb-II. Any questions, comments or bug reports can be addressed to Yvon Rozijn <yrozijn@xs4all.nl>.

Disclaimer

This software is provided "as is". No warranties are made, either expressed or implied, with respect to reliability, quality, performance, or operation of this software. The use of this program is at your own risk. Yvon Rozijn assumes no responsibility or liability for any damage or losses resulting from the use of this software, even if advised of the possibility of such damage or loss.

Copyright

The AWeb JFIF plugin is copyright © 1998 by Yvon Rozijn.
It uses code from the JPEG library that was written by the Independent JPEG Group (IJG).

History

awebjfif.awebplugin 1.1 awebjfif.awebplugin 1.0 (11-02-1998)