ilbmtoppm man page

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:

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 chunk).

-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 is untested.


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

See Also

ppmtoilbm(1), ppm(1)


Copyright (C) 1989 by Jef Poskanzer.

Modified October 1993 by Ingo Wilken (

Document Source

This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The master documentation is at

Referenced By


12 November 2014 netpbm documentation