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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Built in color maps</title><link rel="stylesheet" type="text/css" href="manual.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.0"><link rel="home" href="index.html" title="JpGraph Manual"><link rel="up" href="ch22.html" title="Chapter 22. Matrix graphs"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Built in color maps</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Chapter 22. Matrix graphs</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="sect1" title="Built in color maps"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sec.built-in-colormaps"></a>Built in color maps</h2></div></div></div>
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<p>There are three types of built in color maps</p>
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<p>
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</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
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<p><span class="bold"><strong>Standard maps</strong></span></p>
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<p>Includes rainbow spectrum and heat maps and combination of plain
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red-green-blue maps</p>
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</li><li class="listitem">
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<p><span class="bold"><strong>Normalized center</strong></span></p>
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<p>These maps have a white:ish center. This is mostly useful to visualize the
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spread from a center value</p>
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</li><li class="listitem">
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<p><span class="bold"><strong>Continues</strong></span></p>
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<p>The maps have one base color where the hue changes</p>
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</li></ol></div><p>
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</p>
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<p>In the color maps in the following section the black bars under some colors in the
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color map shows the discrete colors (the plateaus) that the color map is made up of. All
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colors in between two "barred" colors are linear interpolations.</p>
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<p>The script that was used to generate these color maps can be found under the example
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directory as "<code class="filename">colormaps.php</code>".</p>
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<div class="sect2" title="Standard maps"><div class="titlepage"><div><div><h3 class="title"><a name="id2594164"></a>Standard maps</h3></div></div></div>
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<p>To show heat gradient map 0 is the standard color map. To highlight the min and
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max values (to get a high contrast) map 3 is a good choice. Map two is a standard
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"rainbow" spectrum from red all up to violet.</p>
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<div class="figure"><a name="id2594175"></a><p class="title"><b>Figure 22.13. Standard color maps</b></p><div class="figure-contents">
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<div class="mediaobject"><img src="images/colormap_standard.png" alt="Standard color maps"></div>
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</div></div><br class="figure-break">
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</div>
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<div class="sect2" title="Normalized center"><div class="titlepage"><div><div><h3 class="title"><a name="id2594199"></a>Normalized center</h3></div></div></div>
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<p>These maps have a neutral (white) center and feathers out to the min/max value at
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each end.</p>
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<div class="figure"><a name="id2594207"></a><p class="title"><b>Figure 22.14. Centered color map</b></p><div class="figure-contents">
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<div class="mediaobject"><img src="images/colormap_center.png" alt="Centered color map"></div>
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</div></div><br class="figure-break">
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</div>
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<div class="sect2" title="Continues map"><div class="titlepage"><div><div><h3 class="title"><a name="id2594189"></a>Continues map</h3></div></div></div>
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<p>These maps changes continues from the min color to the max color.</p>
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<div class="figure"><a name="id2594238"></a><p class="title"><b>Figure 22.15. Continues color map</b></p><div class="figure-contents">
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<div class="mediaobject"><img src="images/colormap_continues.png" alt="Continues color map"></div>
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</div></div><br class="figure-break">
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</div>
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