ppmtoilbm

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]        [-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,  ppm-
              toilbm  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 ex-
              actly <n> planes.

       -hambits | -hamplanes n
              (default 6, min 3, max 16) Select number of planes for HAM  pic-
              ture.   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  mem-
              ory; turning compression off allows stream-writing of the image,
              but the resulting file will usually be 30% to 50%  larger.   An-
              other  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  col-
              ormap. 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 selec-
       tion algorithm might give better results.  On the other hand, this  al-
       lows 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-olden-
       burg.de)

                                31 October 1993                   ppmtoilbm(1)