Topography with brown montains and snow on top: colormap_topo_snow.xml.

Topography, land is green except highest mountains: colormap_topopgraphy_small.xml.

The program collection cptutils can convert between some of these formats. Most of these color tables use only the RGB color model, except GMT and GIMP, and not all programs support transparency. and many more, some can read the GMT format.

CSS3 contains also a specification of color gradients.

GIMP (*.ggr) contains a graphical editor for color gradients, and can load SVG gradients.

Inkscape, the leading SVG editor, contains a graphical editor for color gradients.

SVG vector graphics files can contain color gradient definitions.

Paraview (*.xml) contains a graphical editor for color tables.GMT (*.cpt) contains the tool makecpt to create color tables.The following programs support color tables (see: and ):

Another source is OpenClipArt, where color gradients are available - if every color appears just once, these gradients can be used for color tables. Thus, in order to visualize discrete values at grid points, it makes sense to convert the point data to cell data.Ī large collection of color tables can be found here: CPT City.

Cell data values are not interpolated, but are constant over the whole grid cell.

Point data values are always interpolated linearly between grid points.

Inkscape gradient more discrete