cptutils

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 1.31 (Aug 2008):

• avlcpt convert avl (ArcView Legend) to cpt
• cptcss convert cpt to fragment of css
• cpthsv modify RGB cpt gradient in HSV space
• cptgimp convert cpt to GIMP gradient
• cptinfo print summary information on a cpt file
• cpttext colour text according to a cpt file
• cptsvg convert cpt to svg gradient
• gimplut convert gimp gradient to binary lookup table (LUT)
• gimpcpt convert gimp gradient to cpt
• pspcpt convert PaintShop Pro gradient to cpt
• svgx convert svg gradient to other formats
• xycpt convert column data to cpt

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