Rainbow Colormap Disadvantages

segmentation artifacts: perceptually nonlinear!

[Rogowitz and Treinish, How NOT to Lie with Visualization,
www.research.ibm.com/dx/proceedings/pravda/truevis.htm
(partial) solution: perceptually isolinear map

[Kindlmann, Reinhard, and Creem. 
Face-based Luminance Matching for Perceptual Colormap Generation. Proc. Vis 02
www.cs.utah.edu/~gk/lumFace]

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