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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] [-com-
press|-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 di-
rect 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 ig-
nored.
-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 AT informatik.de)
31 October 1993 ppmtoilbm(1)
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