NAME

       ppmtoilbm - convert a portable pixmap into an ILBM file

SYNOPSIS

       ppmtoilbm  [-maxplanes|-mp  N]  [-fixplanes|-fp  N]  [-ham6|-ham8]  [-dcbits|-dcplanesrgb]
       [-normal|-hamif|-hamforce|-24if|-24force|      -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 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.

       -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)

                                         31 October 1993                             ppmtoilbm(1)