colormap
https://1.bp.blogspot.com/-KLT05R-KAXY/XVWX59PUhhI/AAAAAAAAEcI/a7Yq7RrA5agSGDwRfzA0UvK4hW4e_1zawCLcBGAs/s640/image26.png
https://gist.github.com/mikhailov-work/6a308c20e494d9e0ccc29036b28faa7a
https://ai.googleblog.com/2019/08/turbo-improved-rainbow-colormap-for.html
https://github.com/kbinani/colormap-shaders
https://github.com/jgreitemann/colormap
#utility
#code