👍 from me.

We need to be sure there is no copyright or license problem.
Also, the map seems to have very little dynamic range--less than the single color or gray maps.

Also, the map seems to have very little dynamic range--less than the single color or gray maps.

Yes, I agree. For me this continuous colormap it is as effective as choosing 2 discrete colours. I'm not confident I could infer anything other than boolean values from this scale...

@efiring On consideration, I am now too worried about licensing issues.

@pelson What do you think about the heatmaps shown on the link I provided? I am certainly able to infer more than boolean values out of it. Or do you mean that it is only useful as a discrete map? For the small dynamic range, I think that expected given that this is meant to be functional for people with the deuteranopia form of colorblindness.

As for copyright, I'm no expert, but I'm amused that copyright is even a concern here. I could change one of the colors just slightly but in a way that the eye probably would not notice. The original one was also not continuous.

Should we just write a script to generate all possible (equally spaced) interpolated colormaps on 5 colors and declare all of them to be in the public domain except the ones that have prior copyrights? Ignoring opacity, there are at most (256^3)^5 of them...and in practice far fewer, due to degeneracy. They even have a nice visual tool to help out: http://wistia.com/colortest

Here is another demonstration of the colormap. These are per-player heatmaps, each representing when a player was logged into an online game within 24-hour period, sampled every 15 minutes:

Independent of any other copyright issues, the name should probably be changed to something other than 'wistia'.

@chebee7i Well, I think it would be awesome if it was called "Wistia," though I understand if that makes no sense. Don't worry about copyright or tweaking hex values, Wistia is collectively delighted to see others using the color-blind-friendly heatmap palette. 👍

Great. Thanks for chiming in @jringenberg.

Ping? This is ready for acceptance or rejection. It just needs a decision.

@jringenberg Is there any way we could get a more official blessing to use your color map? Your company might be cool with it now, but could always be bought by Oracle.

Could you published publicly (or just pointed me at where this is already done) the color map (with enough detail to reproduce it) with a permissive license (BSD or more permissive)?

That is what it would take to get me to push the green button, if others feel differently I will not block it.

@tacaswell @chebee7i Sorry this took awhile, I just put it up here: https://github.com/wistia/heatmap-palette

I updated the color values. The test failure seems unrelated. Can anyone restart it?

Can you add a note with the link that it is MIT licensed?

This should also get an entry in the CHANGELOG and an entry in whats_new.rst (as this is a cool new feature that should be advertised).

I think at this point this is down to housekeeping. (don't worry about that test fail).

Let me know if anything else needs to be added. Otherwise, I think its ready.

The branch needs to be re-based now (it won't merge cleanly). The problem in conflicts in CHANGLOG and/or whats_new.rst.

Should be good now (hopefully). 🎱

The 3.2 failure seems to be an intermittent font issue....

👍 to merge from me if @pelson and @efiring are happy.

Fine with me.