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| On Oct 22, 2012, at 3:36 PM, Brian Maffitt wrote: > Add is your best bet for this, or maybe screen, but in either case you'll want to add a levels effect to the layer to control the reflection strength and contrast. One thing about Screen is that it never gives you a white pixel unless one of the inputs is itself white. If you have an 60% white reflection over an 60% white graphic, the output from Screen will be 84% white while the output from Add will be 120% (which will clip to 100% on output). If realism is your goal, you really want those reflections to blow out to full white as they would in the real world. But as I said, you might find Add to be too aggressive unless you're in linear space. Screen is a hack to do an add-like thing in video space. Fun fact: the real origin of Screen is that it's the transfer mode used on the alpha channels. Brendan |
