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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Ppmtoilbm User Manual</title></head>
<body>
<h1>ppmtoilbm</h1>
Updated: 28 June 2015
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
ppmtoilbm - convert a PPM image into an ILBM file
<h2 id="synopsis">SYNOPSIS</h2>
<b>ppmtoilbm</b>
[<b>-maxplanes</b>|<b>-mp</b> <i>N</i>]
[<b>-fixplanes</b>|<b>-fp</b> <i>N</i>]
[<b>-ham6</b>|<b>-ham8</b>]
[{<b>-dcbits</b>|<b>-dcplanes</b>} <i>r</i> <i>g</i> <i>b</i>]
[
<b>-normal</b>|<b>-hamif</b>|<b>-hamforce</b>|<b>-24if</b>|<b>-24force</b>|
<b>-dcif</b>|<b>-dcforce</b>|<b>-cmaponly</b>
]
[<b>-ecs</b>|<b>-aga</b>]
[<b>-compress</b>|<b>-nocompress</b>]
[<b>-cmethod</b> <i>type</i>]
[<b>-map</b> <i>ppmfile</i>]
[<b>ppmfile</b>]
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>ppmtoilbm</b> reads a PPM image as input. Produces an ILBM file
as output. <b>ppmtoilbm</b> understands the following ILBM types:
<ul compact>
<li>Normal ILBMs with 1-16 planes
<li>Amiga HAM with 3-16 planes
<li>24 bit
<li>Color map (BMHD + CMAP chunk only, nPlanes = 0)
<li>Unofficial direct color. 1-16 planes for each color component.
</ul>
<p>Chunks written: BMHD, CMAP, CAMG (only for HAM), BODY (not for
colormap files) unofficial DCOL chunk for direct color ILBM.
<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>ppmtoilbm</b> recognizes the following
command line options:
<p>Options marked with (*) can be prefixed with a "no",
e.g. "-nohamif". All options can be abbreviated to their
shortest unique prefix.
<dl compact>
<dt><b>-maxplanes</b> | <b>-mp</b> <i>n</i>
<dd>(default 5, minimum 1, maximum 16) Maximum planes to write in a
normal ILBM. If the image does not fit into <n> planes,
ppmtoilbm writes a HAM file (if -hamif is used), a 24bit file (if
-24if is used) or a direct color file (if -dcif is used) or aborts
with an error.
<dt><b>-fixplanes</b> | <b>-fp</b> <i>b</i>
<dd>(min 1, max 16) If a normal ILBM is written, it will have exactly
<n> planes.
<dt><b>-hambits</b> | <b>-hamplanes</b> <i>n</i>
<dd>(default 6, min 3, max 16) Select number of planes for HAM
picture. The current Amiga hardware understands 6 and 8 planes, so for
now you should only use this values.
<dt><b>-normal</b>
<dd>Turns off -hamif/-24if/-dcif, -hamforce/-24force/-dcforce and
-cmaponly. Also sets compression type to byterun1.
<p>This is the default.
<dt><b>-hamif</b> (*)
<dt><b>-24if</b> (*)
<dt><b>-dcif</b> (*)
<dd>Write a HAM/24bit/direct color file if the image does not fit into
<maxplanes> planes.
<dt><b>-hamforce</b> (*)
<dt><b>-24force</b> (*)
<dt><b>-dcforce</b> (*)
<dd>Write a HAM/24bit/direct color file.
<dt><b>-dcbits</b> <i>r</i> <i>g</i> <i>b</i>
<dt><b>-dcplanes</b> <i>r</i> <i>g</i> <i>b</i>
<dd>(default 5, min 1, max 16). Select number of bits for red, green
and blue in a direct color ILBM.
<dt><b>-ecs</b>
<dd>Shortcut for: -hamplanes 6 -maxplanes 5
<p>This is the default.
<dt><b>-aga</b>
<dd>Shortcut for: <b>-hamplanes 8 -maxplanes 8</b>
<dt><b>-ham6</b>
<dd>Shortcut for: <b>-hamplanes 6 -hamforce</b>
<dt><b>-ham8</b>
<dd>Shortcut for: <b>-hamplanes 8 -hamforce</b>
<dt><b>-compress</b> (*)
<dd>This is the default.
<dd>Compress the BODY chunk. The default compression method is
byterun1. Compression requires building the ILBM image in memory;
turning compression off allows stream-writing of the image, but the
resulting file will usually be 30% to 50% larger. Another alternative
is the -savemem option, this will keep memory requirements for
compression at a minimum, but is very slow.
<dt><b>-cmethod</b> <b>none</b>|<b>byterun1</b>
<dd>This option does the same thing as <b>-compress</b>.
<dt><b>-map</b> <i>ppmfile</i>
<dd>Write a normal ILBM using the colors in <ppmfile> as the
colormap. The colormap file also determines the number of planes, a
<b>-maxplanes</b> or <b>-fixplanes</b> option is ignored.
<dt><b>-cmaponly</b>
<dd>Write a colormap file: only BMHD and CMAP chunks, no BODY chunk,
nPlanes = 0.
<dt><b>-savemem</b>
<dd>See the <b>-compress</b> option.
</dl>
<h2 id="limitations">LIMITATIONS</h2>
<p>HAM pictures will always get a grayscale colormap; a real color
selection algorithm might give better results. On the other hand,
this allows row-by-row operation on HAM images, and all HAM images of
the same depth (no. of planes) share a common colormap, which is
useful for building HAM animations.
<h2 id="references">REFERENCES</h2>
Amiga ROM Kernel Reference Manual - Devices (3rd Ed.)
<br>
Addison Wesley, ISBN 0-201-56775-X
<h2 id="seealso">SEE ALSO</h2>
<a href="ppm.html">ppm</a>,
<a href="ilbmtoppm.html">ilbmtoppm</a>
<h2 id="history">HISTORY</h2>
<p>For about a year in 1993-1994, there was a <b>-savemem</b> option.
<h2 id="authors">AUTHORS</h2>
<p>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="#history">HISTORY</a>
<li><a href="#authors">AUTHORS</a>
</ul>
</body>
</html>
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