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<div><h2 id="a0000000144">1.47.17 colourmap</h2>
<p><a name="a0000001152" id="a0000001152"></a> </p><pre>
set colourmap ( rgb<r>:<g>:<b> |
hsb<h>:<s>:<b> |
cmyk<c>:<m>:<y>:<k> )
[ mask <expr> ]
</pre><p>The setting <tt class="tt">colourmap</tt> is used to specify the mapping between ordinate values and colours used by the <tt class="tt">colourmap</tt><a name="a0000001153" id="a0000001153"></a><a name="a0000001154" id="a0000001154"></a> plot style. As elsewhere in PyXPlot, the colour components should be numerical expressions which evaluate to a value in the range zero to one. Within these expressions, the variables <tt class="tt">c1</tt>, <tt class="tt">c2</tt>, <tt class="tt">c3</tt> and <tt class="tt">c4</tt> refer quantities calculated from the third through sixth columns of data supplied to the <tt class="tt">colourmap</tt><a name="a0000001155" id="a0000001155"></a><a name="a0000001156" id="a0000001156"></a> plot style in a way determined by the <tt class="tt">c<n>range</tt> setting. Thus, the following colour mapping, which is the default, produces a greyscale colour mapping of the third column of data supplied to the <tt class="tt">colourmap</tt><a name="a0000001157" id="a0000001157"></a><a name="a0000001158" id="a0000001158"></a> plot style; further columns of data, if supplied, are not used: </p><pre>
set c1range [*:*] renormalise
set colourmap rgb(c1):(c1):(c1)
</pre><p>If a mask expression is supplied, then any areas in a colour map where this expression evaluates to zero (i.e. false) are made transparent. </p></div>
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