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)