Those who use colour maps a lot (cf. graph twoway contour and siblings) might be interested in Matlab's change from using hue (think rainbow) to distinguish amplitude to using luminance: see http://blogs.mathworks.com/steve/201...with-rainbows/ . The blogpost provides a link to a background paper by a MathWorks' staffer giving more details. [Acknowledgement: I found these links from reading Andrew Gelman's blog at http://andrewgelman.com/2015/03/05/d...t-hard-change/ ]
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