ppmtoilbm(1) - man - phpMan

ppmtoilbm(1)                           General Commands Manual                          ppmtoilbm(1)



NAME
       ppmtoilbm - convert a portable pixmap into an ILBM file

SYNOPSIS
       ppmtoilbm  [-maxplanes|-mp  N] [-fixplanes|-fp N] [-ham6|-ham8] [-dcbits|-dcplanesrgb] [-nor‐‐
       mal|-hamif|-hamforce|-24if|-24force| -dcif|-dcforce|-cmaponly] [-ecs|-aga] [-compress|-nocom‐‐
       press] [-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 ab‐
       breviated 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 re‐
              quires building the ILBM image in memory; turning compression off allows  stream-writ‐
              ing  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 AT informatik.de)




                                           31 October 1993                              ppmtoilbm(1)