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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML><HEAD><TITLE>Ppmtoilbm User Manual</TITLE></HEAD>
<BODY>
<H1>ppmtoilbm</H1>
Updated: 31 October 1993
<BR>
<A HREF="#index">Table Of Contents</A>
<A NAME="lbAB"> </A>
<H2>NAME</H2>
ppmtoilbm - convert a PPM image into an ILBM file
<A NAME="lbAC"> </A>
<H2>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>-savemem</B>]
[<B>ppmfile</B>]
<A NAME="lbAD"> </A>
<H2>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.
<A NAME="lbAE"> </A>
<H2>OPTIONS</H2>
<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 pixmap 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 supports 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>
<A NAME="lbAF"> </A>
<H2>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.
<A NAME="lbAG"> </A>
<H2>REFERENCES</H2>
Amiga ROM Kernel Reference Manual - Devices (3rd Ed.)
<BR>
Addison Wesley, ISBN 0-201-56775-X
<A NAME="lbAH"> </A>
<H2>SEE ALSO</H2>
<A HREF="ppm.html">ppm</A>,
<A HREF="ilbmtoppm.html">ilbmtoppm</A>
<A NAME="lbAI"> </A>
<H2>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>
<A NAME="index"> </A>
<H2>Table Of Contents</H2>
<UL>
<LI><A HREF="#lbAB">NAME</A>
<LI><A HREF="#lbAC">SYNOPSIS</A>
<LI><A HREF="#lbAD">DESCRIPTION</A>
<LI><A HREF="#lbAE">OPTIONS</A>
<LI><A HREF="#lbAF">LIMITATIONS</A>
<LI><A HREF="#lbAG">REFERENCES</A>
<LI><A HREF="#lbAH">SEE ALSO</A>
<LI><A HREF="#lbAI">AUTHORS</A>
</UL>
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