NAME
ilbmtoppm - convert an ILBM file into a portable pixmap
SYNOPSIS
ilbmtoppm [-verbose] [-ignore<chunkID>] [-isham|-isehb] [-adjustcolors]
[ILBMfile]
DESCRIPTION
Reads an IFF ILBM file as input. Produces a portable pixmap as output.
Supported ILBM types are:
Normal ILBMs with 1-16 planes.
Amiga Extra_Halfbrite (EHB)
Amiga HAM with 3-16 planes.
24 bit.
Multiplatte (normal or HAM) pictures.
Color map (BMHD + CMAP chunk only, nPlanes = 0).
Unofficial direct color.
1-16 planes for each color component.
Chunks used:
BMHD, CMAP, CAMG (only HAM & EHB flags used), PCHG, BODY
unofficial DCOL chunk to identify direct color ILBM
Chunks ignored:
GRAB, DEST, SPRT, CRNG, CCRT, CLUT, DPPV, DRNG, EPSF
Other chunks (ignored but displayed in verbose mode):
NAME, AUTH, (c), ANNO, DPI
Unknown chunks are skipped.
OPTIONS
-verbose
Give some information about the ILBM file.
-ignore <chunkID>
Skip a chunk. <chunkID> is the 4-letter IFF chunk identifier of
the chunk to be skipped.
-isham | -isehb
Treat the input file as a HAM or Extra_Halfbrite picture, even
if these flags or not set in the CAMG chunk (or if there is no
CAMG chunk).
-adjustcolors
If all colors in the CMAP have a value of less then 16,
ilbmtoppm assumes a 4-bit colormap and gives a warning. With
this option the colormap is scaled to 8 bits.
BUGS
The multipalette PCHG BigLineChanges and Huffman decompression code is
untested.
REFERENCES
Amiga ROM Kernel Reference Manual - Devices (3rd Ed.)
Addison Wesley, ISBN 0-201-56775-X
SEE ALSO
ppm(5), ppmtoilbm(1)
AUTHORS
Copyright (C) 1989 by Jef Poskanzer.
Modified October 1993 by Ingo Wilken (Ingo.Wilken@informatik.uni-
oldenburg.de)
04 October 1993 ilbmtoppm(1)