ppmtoilbm(1)                                         ppmtoilbm(1)

NAME
       ppmtoilbm - convert a portable pixmap into an ILBM file

SYNOPSIS
       ppmtoilbm    [-maxplanes|-mp    N]    [-fixplanes|-fp   N]
       [-ham6|-ham8] [-dcbits|-dcplanesrgb] [-normal|-hamif|-ham-
       force|-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 col-
              ormap 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 short-
       est 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 sup-
              ports 6 and 8 planes, so for now  you  should  only
              use this values.

       -normal (default)
              Turns       off      -hamif/-24if/-dcif,      -ham-
              force/-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 result-
              ing  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@infor-
       matik.uni-oldenburg.de)

                         31 October 1993                        1