Ilbmtoppm User Manual(1) General Commands Manual Ilbmtoppm User Manual(1) NAME ilbmtoppm - convert an ILBM file into a PPM image SYNOPSIS ilbmtoppm [-ignore<chunkID>] [ -isham | -isnotham | -isehb | -isnotehb | -isdeep | -isnotdeep ] [-cmaponly] [-adjustcolors] [-transparent color] [-maskfile filename [-verbose] [ILBMfile] DESCRIPTION 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 rec- ognize. OPTIONS In addition to the options common to all programs based on libnetpbm (most notably -quiet, see Common Options ⟨index.html#commonoptions⟩ ), ilbmtoppm recognizes the following command line options: -transparent color This is the color that should "show through" in places where the image is transparent. color is like the argument of the pnm_parsecolor() library routine ⟨libnetpbm_image.html#colorname⟩ . -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 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 pix- els in the image and black pixels representing opaque pixels. If you don't specfy this, or the image does not contain trans- parency information, ilbmtoppm does not create a mask file. -cmaponly 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. -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. LIMITATIONS 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 ppmtoilbm(1), ppm(1) AUTHORS Copyright (C) 1989 by Jef Poskanzer. Modified October 1993 by Ingo Wilken (Ingo.Wilken@informatik.uni-olden- burg.de) DOCUMENT SOURCE This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at http://netpbm.sourceforge.net/doc/ilbmtoppm.html netpbm documentation 12 November 2014 Ilbmtoppm User Manual(1)
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