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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]
[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)
HISTORY
For about a year in 1993-1994, there was a -savemem option.
AUTHORS
Copyright (C) 1989 by Jef Poskanzer.
Modified October 1993 by Ingo Wilken (Ingo.Wilken AT informatik.de)
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master
documentation is at
http://netpbm.sourceforge.net/doc/ppmtoilbm.html
netpbm documentation 28 June 2015 Ppmtoilbm User Manual(0)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
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