A Beginner’s Guide to (CIE) Colorimetry
Chandler Abraham

Thanks a lot for this article, it answers a lot of questions I had for years.

I have a follow up question about the Wright/Guild experiments :

> 700nm, 546.1nm and 435.8nm are the primaries of the 1931 RGB color matching functions

How were theses primaries chosen? And what kind of source were used to produce them in 1931?

Also, how were each photoreceptors (LMS) graphs produced?


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