Provided by: netpbm_10.0-15_i386 bug

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)