“The sensitivity curves shown here are normalized approximations (for simpler visualizations and calculations), and are not accurate. In reality, the sensitivity curves are less smooth, and different types of cones have differing levels of sensitivity. For example, the sensitivity of S-cones is significantly lower compared to the other cones. Similarly, rods are more sensitive to light than any of the cones.”
I was thinking to myself this article approaches color better than the majority of color articles I see on the HN front page. Many of them start from RGB and work backwards, often awkwardly with conceptual gaps; at least this start with SPD right out of the gate. The cone response overlap is implied via plots right at the beginning, and the first equation is an integral, and the correct integral… it might not be the most accessible, that may be true, but it’s getting across the right physics concepts first and cleanly separating perception and leaving that murky pit for after the physics is established.