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Does illustrator have the equivalent of an "Add" blend mode? This would mean that

(R=0, G=128, B=255) + (R=255, G=128, B=0) = white

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There isn't an equivalent of Add/Subtract or Linear Dodge/Burn in AI, unfortunately. Using "Lighten" can sometimes get you there, but in almost all cases requires a third layer, set to Lighten or Color Dodge, to "fill in" the remaining channel.

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That's odd! Why is that? And what exactly does "Lighten" do? –  noio Dec 27 '11 at 17:10
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As to why, you'd have to ask the Illustrator team. :-) Lighten works on a channel-by-channel basis, and uses the lighter of the two values for each channel. –  Alan Gilbertson Dec 27 '11 at 19:15
    
Ah, so it's like a per-channel "max". Thanks! –  noio Dec 27 '11 at 23:36

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