Re: [matplotlib-devel] Colormap survey results

[Nathaniel S. <nj...@po...>]

On Jun 17, 2015 8:36 AM, "OceanWolf" <jui...@ya...> 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