"posneg_2" color table

John Fasullo designed this and the posneg_1 colormap where the hue is varying from color to color as opposed to the intensity varying amongst the same color (for example, in the blue->red colormaps). Colormaps containing an array of hues are easier to interpret, particularly for the colorblind.

Note that color maps may look different for different user environments, for example, as a function of your monitor and/or printing device. You may want to tweak the colors for your use.

There's an interesting article on improving color maps for scientific visualizations entitled "The End of the Rainbow? Color Schemes for Improved Data Graphics". Click on the PDF file to download the article, or view some of the PNG files for comparisons of color maps.

gsn_define_colormap(wks,"posneg_2")