On Jun 17, 2015 8:36 AM, "OceanWolf" <juichenieder-n...@yahoo.co.uk> wrote: > > Another question, why does a reason exist why the colour-maps start at yellow and go to blue, either anti-clockwise, or clockwise? What about a rotation of 90deg rather than just a mirror inverse on the a' b' plane?
Colorblind users can reliably distinguish blue/yellow and dark/light, but that's all, so an accessible colormap has to use those for its dominant axis. And then you have to do dark+bluish and light+yellowish if you want something colorful, because it just turns out that the way the brain works, there is no such thing as a saturated light blue or a saturated dark yellow. -n
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