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Ppmtoilbm User Manual(0)                              Ppmtoilbm User Manual(0)



NAME
       ppmtoilbm - convert a PPM image into an ILBM file


SYNOPSIS
       ppmtoilbm

       [-maxplanes|-mp N]

       [-fixplanes|-fp N]

       [-ham6|-ham8]

       [{-dcbits|-dcplanes} r g b]

       [ -normal|-hamif|-hamforce|-24if|-24force| -dcif|-dcforce|-cmaponly ]

       [-ecs|-aga]

       [-compress|-nocompress]

       [-cmethod type]

       [-map ppmfile]

       [-savemem]

       [ppmfile]


DESCRIPTION
       This program is part of Netpbm(1).

       ppmtoilbm  reads  a  PPM image as input.  Produces an ILBM file as output.  ppmtoilbm understands the following
       ILBM types:




       ?      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 image 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 b
              (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
              Turns  off -hamif/-24if/-dcif, -hamforce/-24force/-dcforce and -cmaponly.  Also sets compression type to
              byterun1.

              This is the default.


       -hamif (*)

       -24if (*)

       -dcif (*)
              Write a HAM/24bit/direct color file if the image does not fit into <maxplanes> planes.


       -hamforce (*)

       -24force (*)

       -dcforce (*)
              Write a HAM/24bit/direct color file.


       -dcbits r g b

       -dcplanes r g b
              (default 5, min 1, max 16).  Select number of bits for red, green and blue in a direct color ILBM.


       -ecs   Shortcut for: -hamplanes 6 -maxplanes 5

              This is the default.


       -aga   Shortcut for: -hamplanes 8 -maxplanes 8


       -ham6  Shortcut for: -hamplanes 6 -hamforce


       -ham8  Shortcut for: -hamplanes 8 -hamforce


       -compress (*)
              This is the default.  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.


       -cmethod none|byterun1
              This option does the same thing as -compress.


       -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.





LIMITATIONS
       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(1), ilbmtoppm(1)


AUTHORS
       Copyright (C) 1989 by Jef Poskanzer.

       Modified October 1993 by Ingo Wilken (Ingo.WilkenATinformatik.de)



netpbm documentation            31 October 1993       Ppmtoilbm User Manual(0)