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diff --git a/ppmtopcx.html b/ppmtopcx.html new file mode 100644 index 00000000..5ab9223e --- /dev/null +++ b/ppmtopcx.html @@ -0,0 +1,205 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML><HEAD><TITLE>Ppmtopcx User Manual</TITLE></HEAD> +<BODY> +<H1>ppmtopcx</H1> +Updated: 27 March 2004 +<BR> +<A HREF="#index">Table Of Contents</A> + +<A NAME="lbAB"> </A> +<H2>NAME</H2> + +ppmtopcx - convert a PPM image to a PCX file + +<A NAME="lbAC"> </A> +<H2>SYNOPSIS</H2> + +<B>ppmtopcx</B> + +[<B>-24bit</B>] + +[<B>-8bit</B>] + +[<B>-packed</B>] + +[<B>-stdpalette</b>] + +[<B>-palette=</b><i>palettefile</i>] + +[<B>-planes=</b><i>planes</i>] + +[<B>-xpos=</B><I>cols</I>] + +[<B>-ypos=</B><I>rows</I>] + +[<I>ppmfile</I>] + +<A NAME="lbAD"> </A> +<H2>DESCRIPTION</H2> + +<p>This program is part of <a href="index.html">Netpbm</a>. + +<p><b>ppmtopcx</b> reads a PPM image as input and produces a PCX file +as output. The type of the PCX file depends on the number of colors +in the pixmap: + +<DL COMPACT> +<DT>16 colors or fewer: + +<DD>1 bit/pixel, 1-4 planes. + +<DT>more than 16 colors, but no more than 256: + +<DD>8 bits/pixel, 1 plane, colormap at the end of the file. + +<DT>More than 256 colors: + +<DD>24bit truecolor file (8 bits/pixel, 3 planes). + +</DL> + +<p>You can override some of that and explicitly choose the format with +the options below. + + +<A NAME="lbAE"> </A> +<H2>OPTIONS</H2> + +<DL COMPACT> +<DT><B>-24bit</B> + +<DD>Produce a 24bit truecolor PCX file, even if the image has 256 +colors or fewer. + +<DT><B>-8bit</B> + +<DD>Produce an 8bit (256 colors) PCX file, even if the image has 16 +colors or fewer. + +<p>This option was added in Netpbm 10.18 (August 2003). + +<DT><B>-packed</B> + +<DD>Use "packed pixel" format for files with 16 colors or +fewer: 1, 2, or 4 bits/pixel, 1 plane. + +<DT><B>-stdpalette</B> + +<DD>Instead of computing a palette from the colors in the image, use +a standard, built-in 16 color palette. If the image contains a color +that is not in the standard palette, <b>ppmtopcx</b> fails. + +<p>The standard palette is not only a set of colors, but a specific +mapping of palette indexes to colors. E.g. red is 4. + +<p>You can use <b>pnmremap</b> with a suitable PPM image of the standard +palette to adapt your image to use exactly those colors in the palette +so that <b>ppmtopcx -stdpalette</b> will work on it. + +<p>The file <b>pcxstd.ppm</b>, part of Netpbm, contains the standard +palette. + +<p>Although the PCX header tells exactly what palette is used in the +file, some older PCX interpreters do not use that information. They +instead assume the standard palette. If you don't use the +<b>-stdpalette</b> option, <b>ppmtopcx</b>, <b>ppmtopcx</b> may create +an image that uses a different palette (a rearrangement of the same +colors) and then one of these older interpreters would interpret the +colors in the image wrong. + +<p>You cannot specify this option along with <b>-palette</b>. + +<p>This option was new in Netpbm 10.22 (April 2004). + +<dt><b>-palette=</b><i>palettefile</i> + +<dd>Instead of computing the palette from the colors in the image, use +the palette from the file <i>palettefile</i>. If the palette contains +a color that is not in that palette, <b>ppmtopcx</b> fails. + +<p>The palette file must be a PPM image that contains one pixel for +each color in the palette. It doesn't matter what the aspect ratio +of the palette image is. The order of the colors in the PCX palette +is the order of the pixels in the PPM image in standard western +reading order (left to right, top to bottom). If there is a duplicate +color in the palette, <b>ppmtopcx</b> chooses between them arbitrarily +in building the PCX raster. + +<p>You would need this only if you have a PCX reader that can't read +the palette that is in the PCX file and instead assumes some particular +palette. See also the <b>-stdpalette</b> option. + +<p>If your input image might contain colors other than those in your +palette, you can convert the input image to one that contains only +those colors in your palette with <b>pnmremap</b>. + +<p>You cannot specify this along with <b>-stdpalette</b>. + +<p>This option was new in Netpbhm 10.25 (October 2004). + +<DT><B>-planes=</b><i>planes</i> + +<DD>Generate a PCX file with <i>planes</i> planes, even though the number +of colors in the image could be represented in fewer. This makes the file +larger, but some PCX interpreters are capable of processing only certain +numbers of planes. + +<p>This is meaningful only when <b>ppmtopcx</B> generates an image in +the 16 color palette format without packed pixels. Consequently, you +cannot specify this option together with <b>-24bit</b> or +<b>-8bit</b> or <b>-packed</b>. + +<p>The valid values for <i>planes</i> are 1, 2, 3, and 4. By default, +<b>ppmtopcx</b> chooses the smallest number of planes that can represent +the colors in the image. E.g. if there are 5 colors, <b>ppmtopcx</b> +chooses 3 planes. + +<p>This option was new in Netpbm 10.21 (March 2004). + +<DT><B>-xpos=</B><I>cols</I> + +<DT><B>-ypos=</B><I>rows</I> + +<DD> These options set the position of the image in some field +(e.g. on a screen) in columns to the right of the left edge and rows +below the top edge. The PCX format contains image position +information. Don't confuse this with the position of an area of +interest within the image. For example, using <B>pnmpad</B> to add a +10 pixel left border to an image and then converting that image to PCX +with xpos = 0 is not the same as converting the original image to PCX +and setting xpos = 10. + +<P>The values may be from -32767 to 32768. + +<P>The default for each is zero. + +</DL> + + +<A NAME="lbAF"> </A> +<H2>SEE ALSO</H2> + +<B><A HREF="pcxtoppm.html">pcxtoppm</A></B>, +<B><A HREF="ppm.html">ppm</A></B> + +<A NAME="lbAG"> </A> +<H2>AUTHORS</H2> + +Copyright (C) 1994 by Ingo Wilken (<A +HREF="mailto:Ingo.Wilken@informatik.uni-oldenburg.de">Ingo.Wilken@informatik.uni-oldenburg.de</A>) + +<p>Based on previous work by Michael Davidson. + +<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">SEE ALSO</A> +<LI><A HREF="#lbAG">AUTHORS</A> +</UL> +</BODY> +</HTML> |