[ENH]: callable color map of Plasma with Deuteranopia colourblind filter

[hrwakeford]

Problem

It would be super useful if there was a cmap that was in the default colour-blind colours of the Plasma map.

Image: left side color mask using Sim Daltonism application on Mac set to Deuteranopia colour-blindness, right side Plasma

This would mean that a colour-blind map is the same for a majority of readers and in the caption we can point to the same colours as what the majority Color-blind would see. This is especially pertinent in scientific publications but almost certainly has other uses too.

Proposed solution

Generate a color map that matches the gradients of the current maps when using Sim Daltonism or other software to generate Color-blind schemes that would look the same to "all" (barring the rarer types of Color-blindness) users.

[mwaskom]

It sounds like you might want to use the cividis map: https://github.com/benmaier/cividis.

in the caption we can point to the same colours as what the majority Color-blind would see

With any of the perceptually-uniform sequential colormaps in the viridis family, you should be able to use the universally-accessible terms "ligher" and "darker" to describe regions (or the polarity) of the colormap, and I'd suggest doing this over using hue terms like "blue" and "yellow". A problem with the colormap you're proposing here (and with cividis imo, but somewhat less so) is that it effectively turns the colormap into a bipolar scale that implies a categorical boundary somewhere around the midpoint, which may not be an accurate representation of the nature of your data. Unfortunately, color is super complicated.

[rcomer]

Note that cividis is one of Matplotlib's built in color maps, so you do not need to install the linked package.

[scottshambaugh]

Linking this related ticket #17893

[rcomer]

I am going to close this one as it seems like cividis should fulfil the requirements of the use-case, and because Matplotlib is in general very conservative about adding new colour maps. It can always be re-opened if anyone thinks there is more to do here.