ilbmtoppm
Updated: 04 October 1993
Table Of Contents
NAME
ilbmtoppm - convert an ILBM file into a PPM image
SYNOPSIS
ilbmtoppm
[-verbose]
[-ignore<chunkID>]
[-isham|-isehb]
[-adjustcolors]
[ILBMfile]
DESCRIPTION
This program is part of Netpbm.
ilbmtoppm reads an IFF ILBM file as input and produces a PPM
image as output. ilbmtoppm can handle the following ILBM types:
- 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.
ilbmtoppm uses these ILBM chunks: BMHD, CMAP, CAMG (only HAM
& EHB flags used), PCHG, BODY unofficial DCOL chunk to identify
direct color ILBM. It ignores these chunks: GRAB, DEST, SPRT, CRNG,
CCRT, CLUT, DPPV, DRNG, EPSF. It ignores, but displays in verbose
mode, these: NAME, AUTH, (c), ANNO, DPI. It skips chunks whose type
it doesn't recognize.
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 are 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.
LIMITATIONS
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
ppmtoilbm,
ppm
AUTHORS
Copyright (C) 1989 by Jef Poskanzer.
Modified October 1993 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
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