1. NAME

ilbmtoppm - convert an ILBM file into a portable pixmap

2. SYNOPSIS

ilbmtoppm [ -verbose ] [ -ignore <chunkID> ] [ -isham | -isehb ] [ -adjustcolors ] [ ILBMfile ]

3. 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 unofficial 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.
        .SH 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 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, ilbmtoppm assumes a 4-bit colormap and gives a warning. With this option the colormap is scaled to 8 bits.

4. BUGS

The multipalette PCHG BigLineChanges and Huffman decompression code is untested.

5. REFERENCES

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

6. SEE ALSO

ppm(5), ppmtoilbm(1)

7. AUTHORS

Copyright (C) 1989 by Jef Poskanzer.
Modified October 1993 by Ingo Wilken ( )