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Old February 4th, 2009, 02:50 PM   #1
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After Effects Question - Keying

Hey AE experts - I'm thinking of purchasing AE for a project, here's a question regarding matting (and I'm not seeking a tutorial, just want to know if it's possible):

Say you're pulling a luma or color key, and you have the key dialed in to where you're happy. Then you want to do something radical to the footage that affects the color - say keyframe it so the saturation fades out or brightness, color balance, etc. changes.

Since the matte produced by the keying process is based on things like color & luma, will your key then fall apart? Or is there a way to lock the key or separate it from the footage (but still aligned with the footage spatially and temporally) so it remains a useable mask.

My real expertise is in Photoshop; the Photoshop metaphor would be making a mask and then converting it to an adjustment layer or layer mask, a free-standing thing independent of the data on the image layer - is there an AE function like that?

THANKS! - MC
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Old February 4th, 2009, 03:57 PM   #2
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Hi Michael,
AE allows you to add an 'Adjustment layer' too...
Stick it at the top of the stack and you should be able to do what you suggest.

Gareth
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Old February 5th, 2009, 11:13 AM   #3
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Effects in AE are in an order from top to bottom. If you add a Luma Key, and then a color balance effect it will not change your key at all. You could even move the color effect up to apply BEFORE the Luma Key if you wish -and things may change. So the order in which you have the effects can affect the image in different ways. So you have nothing to worry about.
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Old February 5th, 2009, 04:44 PM   #4
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thanks guys!
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