ilbmtoppm Man page

ilbmtoppm General Commands Manual ilbmtoppm

NAME

ilbmtoppm – convert an ILBM file into a portable pixmap

SYNOPSIS

ilbmtoppm [-verbose] [-ignore] [-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 unoffi‐
cial 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
Skip a chunk. 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, ilbm‐
toppm 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

AUTHORS
Copyright (C) 1989 by Jef Poskanzer.
Modified October 1993 by Ingo Wilken (Ingo.Wilken@informatik.uni-olden‐
burg.de)

04 October 1993 ilbmtoppm