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by TeMPOraL 3387 days ago
I'll add my shot at converting RGB to CIE (XY + brightness) I wrote for my command line controller for Hue lights:

https://github.com/TeMPOraL/hju/blob/39b0c2c27f5f076a93b360d...

(code in Common Lisp)

Hue documentation (available after registering with them) also has example algorithm in (AFAIR) Objective-C.

EDIT: replaced Github link with commit permalink, in case I change the file in the future.