NAME
          ppmtoilbm - convert a portable pixmap into an ILBM file

     SYNOPSIS
          ppmtoilbm [-maxplanes|-mp N] [-fixplanes|-fp N] [-ham6|-
          ham8] [-dcbits|-dcplanesrg [-normal|-hamif|-hamforce -
          dcif|-dcforce|-cmaponly] [-ecs|-aga] [-compress|-nocompress]
          [-cmethod type] [-mapppmfile] [-savemem] [ppmfile]

     DESCRIPTION
          Reads a portable pixmap as input.  Produces an ILBM file as
          output.  Supported ILBM types are:

          Normal ILBMs with 1-16 planes.

          Amiga HAM with 3-16 planes.

          24 bit.

          Color map (BMHD + CMAP chunk only, nPlanes = 0).

          Unofficial direct color.
               1-16 planes for each color component.

          Chunks written:
               BMHD, CMAP, CAMG (only for HAM), BODY (not for colormap
               files) unofficial DCOL chunk for direct color ILBM

     OPTIONS
          Options marked with (*) can be prefixed with a "no", e.g.
          "-nohamif". All options can be abbreviated to their shortest
          unique prefix.

          -maxplanes | -mp n
               (default 5, minimum 1, maximum 16) Maximum planes to
               write in a normal ILBM.  If the pixmap does not fit
               into <n> planes, ppmtoilbm writes a HAM file (if -hamif
               is used), a 24bit file (if -24if is used) or a direct
               color file (if -dcif is used) or aborts with an error.

          -fixplanes | -fp n
               (min 1, max 16) If a normal ILBM is written, it will
               have exactly <n> planes.

          -hambits | -hamplanes n
               (default 6, min 3, max 16) Select number of planes for
               HAM picture.  The current Amiga hardware supports 6 and
               8 planes, so for now you should only use this values.

          -normal (default)
               Turns off -hamif/-24if/-dcif, -hamforce/-24force/-
               dcforce and -cmaponly.  Also sets compression type to



     Page 1                                           (printed 3/1/94)






     ppmtoilbm(1)         AMIGA (31 October 1993)         ppmtoilbm(1)



               byterun1.

          -hamif (*)

          -24if (*)

          -dcif (*)
               Write a HAM/24bit/direct color file if the pixmap does
               not fit into <maxplanes> planes.

          -hamforce (*)

          -24force (*)

          -dcforce (*)
               Write a HAM/24bit/direct color file.

          -dcbits | -dcplanes r g b
               (default 5, min 1, max 16).  Select number of bits for
               red, green & blue in a direct color ILBM.

          -ecs (default)
               Shortcut for: -hamplanes 6 -maxplanes 5

          -aga

          Shortcut for: -hamplanes 8 -maxplanes 8

          -ham6

          Shortcut for: -hamplanes 6 -hamforce

          -ham8
               Shortcut for: -hamplanes 8 -hamforce

          -compress (*) (default)

          -cmethod none|byterun1
               Compress the BODY chunk.  The default compression
               method is byterun1.  Compression requires building the
               ILBM image in memory; turning compression off allows
               stream-writing of the image, but the resulting file
               will usually be 30% to 50% larger.  Another alternative
               is the -savemem option, this will keep memory
               requirements for compression at a minimum, but is very
               slow.

          -map ppmfile
               Write a normal ILBM using the colors in <ppmfile> as
               the colormap. The colormap file also determines the
               number of planes, a -maxplanes or -fixplanes option is
               ignored.



     Page 2                                           (printed 3/1/94)






     ppmtoilbm(1)         AMIGA (31 October 1993)         ppmtoilbm(1)



          -cmaponly
               Write a colormap file: only BMHD and CMAP chunks, no
               BODY chunk, nPlanes = 0.

          -savemem
               See the -compress option.

     BUGS
          HAM pictures will always get a grayscale colormap; a real
          color selection algorithm might give better results.  On the
          other hand, this allows row-by-row operation on HAM images,
          and all HAM images of the same depth (no. of planes) share a
          common colormap, which is useful for building HAM
          animations.

     REFERENCES
          Amiga ROM Kernel Reference Manual - Devices (3rd Ed.)
          Addison Wesley, ISBN 0-201-56775-X

     SEE ALSO
          ppm(5), ilbmtoppm(1)

     AUTHORS
          Copyright (C) 1989 by Jef Poskanzer.
          Modified October 1993 by Ingo Wilken
          (Ingo.Wilken@informatik.uni-oldenburg.de)





























     Page 3                                           (printed 3/1/94)