Cptutils

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The GMT package implements colour gradients with the cpt (colour palette) file format, and provides some tools for creating and manipulating them. The cptutils package contains a number of additional utilities, mostly for translation to and from other formats. In version 1.22 (November 2005),

This example palette was converted from the gimp gradient sunrise with gimpcpt.

http://www.vindaloo.uklinux.net/jjg/code/Sunrise.png

The cptutils package was written to aid the construction of the cpt archive cpt-city (where hundreds of cpt files can be downloaded). The Unix source distribution for the package can be downloaded here (you will need to have libxml2 installed to compile it).