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| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2006-12-25 03:06:05 +0000 |
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| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2006-12-25 03:06:05 +0000 |
| commit | 1017cbebe5d5edd859e0fddad0a8600f509f4821 (patch) | |
| tree | 78bdf336648566f7a7d55f42837357dea3dd674c /ppmcolormask.html | |
| parent | 16f2ac126651015a376eba864a3a35f738b0b25a (diff) | |
| download | netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.tar.gz netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.tar.xz netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.zip | |
Place user guide into Subversion repository
git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@181 9d0c8265-081b-0410-96cb-a4ca84ce46f8
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1 files changed, 139 insertions, 0 deletions
diff --git a/ppmcolormask.html b/ppmcolormask.html new file mode 100644 index 00000000..82cf12e5 --- /dev/null +++ b/ppmcolormask.html @@ -0,0 +1,139 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML><HEAD><TITLE>Ppmcolormask User Manual</TITLE></HEAD> + +<BODY> + +<H1>ppmcolormask</H1> +Updated: 1 May 2006 +<BR> +<A HREF="#index">Table Of Contents</A> + +<H2>NAME</H2> + +ppmcolormask - produce mask of areas of a certain color in a PPM file + +<H2 id="synopsis">SYNOPSIS</H2> + +<B>ppmcolormask</B> + +<b>-color=</b><i>color_list</i> + +[<I>ppmfile</I>] + +<p>Obsolete: + +<p> +<B>ppmcolormask</B> + +<I>color</I> + +[<I>ppmfile</I>] + +<h2 id="examples">EXAMPLES</h2> + +<pre> +<code> + ppmcolormask -color red testimg.ppm >redmask.pbm + pamcomp background.ppm testimg.ppm -alpha=redmask.pbm >test.ppm + + ppmcolormask -color=red,pink,salmon testimg.ppm >reddishmask.pbm + + ppmcolormask -color=bk:red,bk:orange,bk:yellow testimg.ppm >firemask.pbm + +</code> +</pre> + +<H2 id="description">DESCRIPTION</H2> + +<p>This program is part of <a href="index.html">Netpbm</a>. + +<P><b>ppmcolormask</b> reads a PPM file as input and produces a PBM +(bitmap) file as output. The output file is the same dimensions as +the input file and is black in all places where the input file is a +color indicated by the <b>-color</b> option, and white everywhere +else. + +<P>The output of <B>ppmcolormask</B> is useful as an alpha mask input +to <B>pamcomp</B>. Note that you can generate such an alpha mask +automatically as you convert to PNG format with <B><A +HREF="pnmtopng.html">pnmtopng</A></B>. Use its <B>-transparent</B> +option. + +<P><I>ppmfile</I> is the input file. If you don't specify +<I>ppmfile</I>, the input is from Standard Input. + +<P>The output goes to Standard Output. + +<p>In the obsolete alternative syntax, specifying the <i>color</i> +names a single exact color to be masked. + +<p><b>ppmchange</b> does a similar thing: it modifies an image by +changing colors you specify to other colors you specify. The two +programs give you somewhat different means of specifying colors in the +input image. + +<p>To make a mask of an image's background, without having to tell it +what color it is, use <b>pambackground</b>. + +<h2 id="options">OPTIONS</h2> + +<dl> +<dt><b>-color=</b><I>color_list</I> + +<dd>This mandatory option specifies the colors that are to be masked +(where the image is one of these colors, the output mask will be black). + +<p>Examples: + +<ul> +<li><b>-color=red</b> +<li><b>-color=red,pink,salmon</b> +<li><b>-color=rgb:80/80/ff</b> +<li><b>-color=bk:red,bk:orange,bk:yellow</b> +</ul> + +<p><i>color_list</i> is a list of colors separated by commas. Each +color is either an exact color name as described for the <a +href="libppm.html#colorname">argument of the <b>ppm_parsecolor()</b> +library routine</a> or one of the <a +href="libppm.html#berlinkay">Berlin-Kay color names</a>. In the +latter case, all colors that are better described by that Berlin-Kay +color name than any other are in the mask set. + +<p>The algorithm <b>ppmcolormask</b> uses to determine to which colors +a Berlin-Kay color name applies is based on a Sugeno-type fuzzy +inference system developed by <a +href="mailto:kenan@unix.ba">Kenan Kalajdzic</a> in 2006. The +fuzzy model consists of partially linear membership functions defined +in the HSV color space. Although more complex algorithms for fuzzy +color matching exist, this algorithm is intentionally simplified to +achieve a satisfactory speed using relatively compact code. + +<p>This option was new in Netpbm 10.34 (June 2006). Before that, +you must use the <i>color</i> argument and cannot specify a Berlin-Kay +color. + +</dl> + +<H2 id="seealso">SEE ALSO</H2> + +<B><A HREF="pambackground.html">pambackground</A></B>, +<B><A HREF="ppmchange.html">ppmchange</A></B>, +<B><A HREF="pgmtoppm.html">pgmtoppm</A></B>, +<B><A HREF="pamcomp.html">pamcomp</A></B>, +<B><A HREF="pbmmask.html">pbmmask</A></B>, +<B><A HREF="ppm.html">ppm</A></B> + + +<HR> +<A NAME="index"> </A> +<H2>Table Of Contents</H2> +<UL> +<LI><A HREF="#synopsis">SYNOPSIS</A> +<LI><A HREF="#examples">EXAMPLES</A> +<LI><A HREF="#description">DESCRIPTION</A> +<LI><A HREF="#seealso">SEE ALSO</A> +<LI><A HREF="#author">AUTHOR</A> +</UL> +</BODY> +</HTML> |