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### 8.7 Colour Maps

A number of colour maps are available, and used for instance with the shading modes `density`, `aux` and `weighted`. Not all colour maps are suitable/available in all contexts, and in some cases the maps are by default clipped at one end to avoid for instance white-on-white plotting, but the lists below give an overview of which named colourmaps can be used. Note that custom colourmaps can also be used by supplying a specification like "`red-yellow-blue`".

The absolute colour maps are listed below: these do not depend on the underlying colour of the plotted symbols, so are suitable when only one dataset is being plotted.

Absolute colour maps

The non-absolute colour maps are listed below: these modify an underlying colour, so are suitable for applying to several different datasets with different underlying colours. The representation here shows how they affect several different colours; for each row of pixels the unmodified (value=0) colour is at the left of the image and the most modified (value=1) is at the right.

Non-absolute colour maps

These colour maps have been derived from several sources, including SkyCat/GAIA, MatPlotLib 1.5, Gnuplot, Daniel Michalik, Paul Tol, CMasher, Color Brewer, HCL Wizard, Dave Green, xkcd, and maybe some others I forgot.

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STILTS - Starlink Tables Infrastructure Library Tool Set
Starlink User Note256
STILTS web page: http://www.starlink.ac.uk/stilts/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk