[chayleaf]

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

[edrxty]

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?