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<HTML><HEAD><TITLE>Ilbmtoppm User Manual</TITLE></HEAD>
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<BODY>
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ilbmtoppm
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Updated: 12 November 2014
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Table Of Contents
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NAME
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ilbmtoppm - convert an ILBM file into a PPM image
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SYNOPSIS
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ilbmtoppm
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[-ignore<chunkID>]
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[
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-isham | -isnotham |
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-isehb | -isnotehb |
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-isdeep | -isnotdeep
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]
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[-cmaponly]
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[-adjustcolors]
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[-transparent color]
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[-maskfile filename
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[-verbose]
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[ILBMfile]
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DESCRIPTION
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This program is part of Netpbm.
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ilbmtoppm reads an IFF ILBM file as input and produces a PPM
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image as output. ilbmtoppm can handle the following ILBM types:
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Normal ILBMs with 1-16 planes.
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Amiga Extra_Halfbrite (EHB)
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Amiga HAM with 3-16 planes.
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24 bit.
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Multiplatte (normal or HAM) pictures.
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Color map (BMHD + CMAP chunk only, nPlanes = 0).
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Unofficial direct color. 1-16 planes for each color component.
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ilbmtoppm uses these ILBM chunks: BMHD, CMAP, CAMG (only HAM
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& EHB flags used), PCHG, BODY unofficial DCOL chunk to identify
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direct color ILBM. It ignores these chunks: GRAB, DEST, SPRT, CRNG,
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CCRT, CLUT, DPPV, DRNG, EPSF. It ignores, but displays in verbose
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mode, these: NAME, AUTH, (c), ANNO, DPI. It skips chunks whose type
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it doesn't recognize.
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OPTIONS
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-transparent color
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This is the color that should "show through" in places where
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the image is transparent.
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color is like the argument of
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the ppm_parsecolor() library routine.
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-verbose
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Give some information about the ILBM file.
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-ignore chunkID
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Skip a chunk. chunkID is the 4-letter IFF chunk identifier
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of the chunk to be skipped.
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-isham | -isehb
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Treat the input file as a HAM or Extra_Halfbrite picture, even if
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these flags are not set in the CAMG chunk (or if there is no CAMG
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chunk).
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-maskfile filename
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This names a file for ilbmtoppm to create with the image's
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transparency mask. The mask file is a PBM image which maps to the input image
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with white pixels representing transparent pixels in the image and black
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pixels representing opaque pixels.
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If you don't specfy this, or the image does not contain transparency
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information, ilbmtoppm does not create a mask file.
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-cmaponly
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With this option, ilbmtoppm generates a PPM of the ILBM's color
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map, not the image itself.
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ilbmtoppm does the same thing even without -cmaponly if the
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ILBM is a pure color map stream (it has a bitmap header with an nplanes
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value of zero or has no BODY chunk.
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-adjustcolors
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If all colors in the CMAP have a value of less then 16, ilbmtoppm
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assumes a 4-bit colormap and gives a warning. With this option the
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colormap is scaled to 8 bits.
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LIMITATIONS
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The multipalette PCHG BigLineChanges and Huffman decompression code
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is untested.
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REFERENCES
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Amiga ROM Kernel Reference Manual - Devices (3rd Ed.)
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Addison Wesley, ISBN 0-201-56775-X
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SEE ALSO
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ppmtoilbm,
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ppm
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AUTHORS
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Copyright (C) 1989 by Jef Poskanzer.
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Modified October 1993 by Ingo Wilken (
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HREF="mailto:Ingo.Wilken@informatik.uni-oldenburg.de">Ingo.Wilken@informatik.uni-oldenburg.de)
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Table Of Contents
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SYNOPSIS
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DESCRIPTION
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OPTIONS
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LIMITATIONS
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REFERENCES
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SEE ALSO
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AUTHORS
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</BODY>
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</HTML>
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