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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Ilbmtoppm User Manual</title></head>
<body>
<h1>ilbmtoppm</h1>
Updated: 12 November 2014
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
ilbmtoppm - convert an ILBM file into a PPM image
<h2 id="synopsis">SYNOPSIS</h2>
<b>ilbmtoppm</b>
[<b>-ignore</b><chunkID><b>]</b>
[
<b>-isham</b> | <b>-isnotham</b> |
<b>-isehb</b> | <b>-isnotehb</b> |
<b>-isdeep</b> | <b>-isnotdeep</b>
]
[<b>-cmaponly</b>]
[<b>-adjustcolors</b>]
[<b>-transparent </b><i>color</i>]
[<b>-maskfile</b> <i>filename</i>
[<b>-verbose</b>]
[<i>ILBMfile</i>]
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>ilbmtoppm</b> reads an IFF ILBM file as input and produces a PPM
image as output. <b>ilbmtoppm</b> can handle the following ILBM types:
<ul>
<li>Normal ILBMs with 1-16 planes.
<li>Amiga Extra_Halfbrite (EHB)
<li>Amiga HAM with 3-16 planes.
<li>24 bit.
<li>Multiplatte (normal or HAM) pictures.
<li>Color map (BMHD + CMAP chunk only, nPlanes = 0).
<li>Unofficial direct color. 1-16 planes for each color component.
</ul>
<p><b>ilbmtoppm</b> 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.
<h2 id="options">OPTIONS</h2>
<p>In addition to the options common to all programs based on libnetpbm
(most notably <b>-quiet</b>, see <a href="index.html#commonoptions">
Common Options</a>), <b>ilbmtoppm</b> recognizes the following
command line options:
<dl compact>
<dt><b>-transparent </b><i>color</i>
<dd>This is the color that should "show through" in places where
the image is transparent.
<p><i>color</i> is like the <a href="libnetpbm_image.html#colorname">argument of
the <b>pnm_parsecolor()</b> library routine</a>.
<dt><b>-verbose</b>
<dd>Give some information about the ILBM file.
<dt><b>-ignore</b> <i>chunkID</i>
<dd>Skip a chunk. <i>chunkID</i> is the 4-letter IFF chunk identifier
of the chunk to be skipped.
<dt><b>-isham</b> | <b>-isehb</b>
<dd>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).
<dt><b>-maskfile</b> <i>filename</i>
<dd>This names a file for <b>ilbmtoppm</b> 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.
<p>If you don't specify this, or the image does not contain transparency
information, <b>ilbmtoppm</b> does not create a mask file.
<dt><b>-cmaponly</b>
<dd>With this option, <b>ilbmtoppm</b> generates a PPM of the ILBM's <em>color
map</em>, not the image itself.
<p><b>ilbmtoppm</b> does the same thing even without <b>-cmaponly</b> if the
ILBM is a pure color map stream (it has a bitmap header with an <i>nplanes</i>
value of zero or has no BODY chunk.
<dt><b>-adjustcolors</b>
<dd>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.
</dl>
<h2 id="limitations">LIMITATIONS</h2>
<p>The multipalette PCHG BigLineChanges and Huffman decompression code
is untested.
<h2 id="references">REFERENCES</h2>
Amiga ROM Kernel Reference Manual - Devices (3rd Ed.)
Addison Wesley, ISBN 0-201-56775-X
<h2 id="seealso">SEE ALSO</h2>
<a href="ppmtoilbm.html">ppmtoilbm</a>,
<a href="ppm.html">ppm</a>
<h2 id="authors">AUTHORS</h2>
Copyright (C) 1989 by Jef Poskanzer.
<p>Modified October 1993 by Ingo Wilken (<a
href="mailto:Ingo.Wilken@informatik.uni-oldenburg.de">Ingo.Wilken@informatik.uni-oldenburg.de</a>)
<hr>
<h2 id="index">Table Of Contents</h2>
<ul>
<li><a href="#synopsis">SYNOPSIS</a>
<li><a href="#description">DESCRIPTION</a>
<li><a href="#options">OPTIONS</a>
<li><a href="#limitations">LIMITATIONS</a>
<li><a href="#references">REFERENCES</a>
<li><a href="#seealso">SEE ALSO</a>
<li><a href="#authors">AUTHORS</a>
</ul>
</body>
</html>
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