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<title>ploticus: colors</title>
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<td><br><h2>colors</h2></td>
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<small>
<a href="../doc/welcome.html"><img src="../doc/ploticus.gif" border=0></a><br>
Version 2.41 Mar2009
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<title>Manual page for colors(PL)</title>
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<p>
<b>color</b> specifications control the color of lines, filled areas, and text.<tt> </tt>
<p>
<p>
<a href="../gallery/colors.htm">colors<br><img src="../gallery/colors.gif"></a>
<p>
<p>
<br><br><br>
<h2>How to specify a color</h2>
Colors may be specified by <b>pre-defined name</b>, by <b>RGB</b> specification,
<b>hexadecimal</b> specification (like HTML),
or by <b>gray level</b> specification.<tt> </tt>
<b>Hatch patterns</b> may also be used as colors, for rectangular areas such as bars.<tt> </tt>
With PostScript/EPS, you can also use <b>CMYK</b> and <b>HSB</b> specifications.<tt> </tt>
With PNG, GIF, or EPS, the special color
<tt>transparent</tt> may be used as a background color.<tt> </tt>
<p>
The total length of a color specification string cannot be longer than 38 characters.<tt> </tt>
<br><br><br>
<h2>Predefined color names</h2>
See the illustration above.<tt> </tt>
<br><br><br>
<h2>Custom RGB specifications</h2>
If none of the pre-named colors suit,
a custom RGB specification in the form of
<tt>rgb(</tt><i>R</i>,<i>G</i>,<i>B</i>) may be used.<tt> </tt>
<i>R</i>, <i>G</i>, <i>B</i> are values from 0.0 to 1.0 (1.0 is brightest)
specify the red, green and blue components.<tt> </tt>
No embedded spaces are allowed.<tt> </tt>
The values may be separated by a comma (as above), or by colon (:), dash (-), or
pipe (|).<tt> </tt>
<p>
Example: <tt>rgb(0.4,0.84,0.37)</tt>
<br><br><br>
<h2>Hexadecimal RGB specifications</h2>
Similarly to HTML, you can use 6 or 12 digit hexadecimal RGB color values.<tt> </tt>
<p>
Example: <tt>xA0FFA0</tt>,
<p>
Example: <tt>xAA00FFFFAA00</tt>.
<p>
The older notation eg. <tt>xrgb(A0FFA0)</tt> can also be used.<tt> </tt>
<br><br><br>
<h2>Gray-level specifications</h2>
A gray-level specification in the form of
<tt>gray(</tt><i>G</i><tt>)</tt> or just <i>G</i>,
where <i>G</i> is 0.0-1.0 grey level (1.0 is white).<tt> </tt>
No embeddded spaces are allowed.<tt> </tt>
<p>
PostScript printers can vary considerably
as to the relative darkness of a rendered grey area.<tt> </tt>
<p>
Example: <tt>gray(0.8)</tt>
<br><br><br>
<h2>Custom HSB specifications</h2>
HSB color specifications are valid only with PostScript / EPS.<tt> </tt>
An HSB (hue saturation and brightness) specification in the form of
<tt>hsb(</tt><i>H</i>,<i>S</i>,<i>B</i>),
where <i>R</i>, <i>G</i>, <i>B</i> are values from 0.0 to 1.0.<tt> </tt>
No embedded spaces are allowed.<tt> </tt>
The values may be separated by a comma (as above), or by colon (:), dash (-), or
pipe (|).<tt> </tt>
<br><br><br>
<h2>Custom CMYK specifications</h2>
CMYK color specifications are valid only with PostScript / EPS.<tt> </tt>
A CMYK (cyan, magenta, yellow, black) specification in the form of
<tt>cmyk(</tt><i>C</i><tt>,</tt><i>M</i><tt>,</tt><i>Y</i><tt>,</tt><i>K</i><tt>)</tt>
where <i>C</i><tt>, </tt><i>M</i><tt>, </tt><i>Y</i><tt>, and </tt><i>K</i> are values from 0.0 through 1.0.<tt> </tt>
No embedded spaces are allowed.<tt> </tt>
The values may be separated by a comma (as above), or by colon (:), dash (-), or
pipe (|).<tt> </tt>
<br><br><br>
<h2>Hatch patterns</h2>
<b>Hatch patterns</b> may be used as colors to fill rectangular areas
such as bars. These are most useful when rendering in PostScript
for monochrome hard copy, for situations where the available
gray-level gradations do not provide enough distinct variations.<tt> </tt>
Hatch patterns are specified in the form of <tt>hatch</tt><i>n</i>
where <i>n</i> is 1 - 9. <tt>hatch1</tt> is the lightest and
<tt>hatch9</tt> is the darkest. The hatch line color is always black.<tt> </tt>
Hatch patterns may only be used to fill rectangular areas such as bars;
they won't work for pie graphs or rangesweeps.<tt> </tt>
<br>
<img src="../gallery/hatch.gif">
<br>
<br>
</td></tr>
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<a href="../doc/welcome.html">
<img src="../doc/ploticus.gif" border=0></a><br><small>data display engine <br>
<a href="../doc/Copyright.html">Copyright Steve Grubb</a>
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