>And magenta? It comes from full R and B with no G, activating Filter #1 full-positive, Filter #2 at zero.
This doesn't seem right to me. If the second filter were at zero, you should have a pure red and not something with blue content in it like magenta clearly has.
I think he may be representing the second filter as R+G-B, when R+G-2B would make more sense. The latter system shows FFFFFF as being neutral on the yellow-blue axis, while the former erroneously puts it in the yellow region.
None of these are straight-forward “linear” sums: there are differing amounts of each type of cone cell in the retina (and the proportions vary from one part of the retina to another), there are several levels of combination of signals which we don’t fully understand currently, the eye/brain adapts to what it’s just been looking at, what else is in the visual field, what it knows the light source to be, what “memory colors” it expects for an object, and so forth.
Thinking of the mechanisms of the eye operating directly on “FFFFFF” is a very imprecise model for what’s happening.
This doesn't seem right to me. If the second filter were at zero, you should have a pure red and not something with blue content in it like magenta clearly has.
I think he may be representing the second filter as R+G-B, when R+G-2B would make more sense. The latter system shows FFFFFF as being neutral on the yellow-blue axis, while the former erroneously puts it in the yellow region.