Ilbmtoppm User Manual(0) Ilbmtoppm User Manual(0)

ilbmtoppm - convert an ILBM file into a PPM image

ilbmtoppm [-ignore<chunkID>] [ -isham | -isnotham | -isehb | -isnotehb | -isdeep | -isnotdeep ] [-cmaponly] [-adjustcolors] [-transparent color] [-maskfile filename [-verbose] [ILBMfile]

This program is part of Netpbm(1)

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.

Give some information about the ILBM file.
Skip a chunk. chunkID is the 4-letter IFF chunk identifier of the chunk to be skipped.
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).
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 is untested.

Amiga ROM Kernel Reference Manual - Devices (3rd Ed.) Addison Wesley, ISBN 0-201-56775-X

ppmtoilbm(1) , ppm(5)

Copyright (C) 1989 by Jef Poskanzer.

Modified October 1993 by Ingo Wilken (

04 October 1993 netpbm documentation