René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"fire/ice blue/yellow bipolar colormap","articleBody":"There are several variations of this theme in existence:\n- http://www.neurobiologyofaging.org/article/S0197-4580(09)00296-6/\n- http://www.mathworks.com/matlabcentral/fileexchange/26026-bipolar-colormap\n- http://www.mathworks.com/matlabcentral/fileexchange/24870-fireice--hot-cold--colormap\n\n[I made one using bezier curves](https://gist.github.com/endolith/ef948b924abf289287bd) to reduce banding:\n\n![black middle](https://cloud.githubusercontent.com/assets/58611/13193560/bf7c5738-d748-11e5-8cf9-c75c2c885c27.png)\n\n![w 1](https://cloud.githubusercontent.com/assets/58611/13193568/d4a9d9e6-d748-11e5-8314-f5edb5fb6d8d.png)\n\nIt does have a sharp angle at the midpoint causing a black band for 0, but that's intentional because it's for diverging data.  (would be best with https://github.com/matplotlib/matplotlib/issues/1806) Here it is with a wavelet scalogram:\n\n![bipolar bezier](https://cloud.githubusercontent.com/assets/58611/13193574/eee61ed2-d748-11e5-9454-90d2a198885d.png)\n\nLike Ged Ridgway's, the midpoint brightness can be changed, with gray for surface plots, etc:\n\n![default](https://cloud.githubusercontent.com/assets/58611/13193589/1b0eaccc-d749-11e5-87f6-cb173de29751.png)\n\nand color order flips if midpoint is brighter than gray:\n\n![n 1 bezier](https://cloud.githubusercontent.com/assets/58611/13193622/86e1206a-d749-11e5-8155-942db3a0ee14.png)\n\nWould this be good for inclusion, either as a (cleaned-up) function or as a single fixed map?\n","author":{"url":"https://github.com/endolith","@type":"Person","name":"endolith"},"datePublished":"2016-02-20T01:54:55.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":33},"url":"https://github.com/6033/matplotlib/issues/6033"}