cloudhead/less.js — pull request #591 by qix (2012-01-23 16:25:17+00:00)
Title: Implemented a luma() function call

Deciding whether to use white/black text on top of a given background color is much better decided using the backgrounds "luma" rather than "lightness". Luma is a better measure of the intensity of the light, since it differentiates between colors that we do not see as well (30% red, 59% green, 11% blue).