I think the Wikipedia page is correct, along with the comment above about this being CIE color matching functions. https://news.ycombinator.com/item?id=28651997

I think the Wikipedia page is correct, along with the comment above about this being CIE color matching functions. https://news.ycombinator.com/item?id=28651997 https://news.ycombinator.com/item?id=28651997 The CIE color matching functions are a very interesting topic, and a subtle distinction between cone response and perceived ability to match a given color. The main issue being that we haven’t had any ways until recently to directly measure cone response. The color matching functions are derived from clever experiments that attempt to figure out cone response based on what humans think they see, without opening their heads. This article also has a decent introductory explanation of the color matching functions and where the left hump comes from. https://medium.com/hipster-color-science/a-beginners-guide-to-colorimetry-401f1830b65a https://medium.com/hipster-color-science/a-beginners-guide-t...