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CentOS 7.0 - man page for ppmtoilbm (centos section 0)

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 under-
       stands the following ILBM types:

       o      Normal ILBMs with 1-16 planes

       o      Amiga HAM with 3-16 planes

       o      24 bit

       o      Color map (BMHD + CMAP chunk only, nPlanes = 0)

       o      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 compres-
	      sion 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 mem-
	      ory 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.Wilken@informatik.uni-oldenburg.de)

netpbm documentation			 31 October 1993		 Ppmtoilbm User Manual(0)


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