a few months ago I wrote a bunch of color utilities for working in various colorspaces in emacs. I was exploring different ideas, and sort of left a bunch of sexp's all over the place. Now I'm cleaning up the helpers I created during that time so that they all have a consistent interface. I'm also trying to distill a blog post out of the link reading I did at the time. This is a list of references I mostly went through:

;; https://en.wikipedia.org/wiki/CIELAB_color_space
;; LAB only: https://en.wikipedia.org/wiki/Standard_i...lluminants
;; https://peteroupc.github.io/colorgen.html
;; http://colorizer.org/
;; https://github.com/yurikhan/yk-color/blo...k-color.el
;; https://www.w3.org/TR/WCAG20/#relativeluminancedef
;; emacs shipped color.el