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,
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)
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