man ilbmtoppm (Commandes) - convert an ILBM file into a portable pixmap

NAME

ilbmtoppm - convert an ILBM file into a portable pixmap

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

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.

-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.

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