Updated: 12 November 2014
Table Of Contents
ilbmtoppm - convert an ILBM file into a PPM image
-isham | -isnotham |
-isehb | -isnotehb |
-isdeep | -isnotdeep
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.
- -transparent color
- This is the color that should "show through" in places where
the image is transparent.
color is like the argument of
the ppm_parsecolor() library routine.
- 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
- -maskfile filename
- This names a file for ilbmtoppm to create with the image's
transparency mask. The mask file is a PBM image which maps to the input image
with white pixels representing transparent pixels in the image and black
pixels representing opaque pixels.
If you don't specfy this, or the image does not contain transparency
information, ilbmtoppm does not create a mask file.
- With this option, ilbmtoppm generates a PPM of the ILBM's color
map, not the image itself.
ilbmtoppm does the same thing even without -cmaponly if the
ILBM is a pure color map stream (it has a bitmap header with an nplanes
value of zero or has no BODY chunk.
- 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.
The multipalette PCHG BigLineChanges and Huffman decompression code
Amiga ROM Kernel Reference Manual - Devices (3rd Ed.)
Addison Wesley, ISBN 0-201-56775-X
Copyright (C) 1989 by Jef Poskanzer.
Modified October 1993 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
Table Of Contents