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Although the end user specifies colormaps by giving the name of a set of
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'Look Up Tables' (LUT): a table that associate a scalar value to a
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color defined by its RGBA components.
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In this example, we show how the LUT of an object can be retrieved and
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modified. Specificaly, we start by giving a surf object the 'cool'
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Notice in the resulting image how the surface becomes more transparent
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.. image:: ../generated_images/example_custom_colormap.jpg