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Is it actually not commutative? If you consider them to be filters in the same way you can with the article but on each RGB channel doesn't it still work out? Or is this assuming we're also dealing with reflection in addition to transmission? Or am I missing something entirely?

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transparent red on top of blue means more red and less blue, transparent blue on top of red means the opposite

So we're assuming reflection as well as transmission?

If we're just talking transmission they would both be the same, ie transmitting all red photons and 50% of the green and blue ones while the other filter transmits all blue photons and 50% of the red/green ones. Either stack has 50% red values, 50% blue values and 25% green right?

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