Crazy Homeless Guy Posted July 25, 2011 Share Posted July 25, 2011 (edited) I have a question about matting in AfterEffects. I would like to generate a matte from a Vray WireColor pass. This pass is based on the wire color, and often ranges from purples , greens, oranges, yellows, etc.. I am not sure if there is a way to set a matte based on one of the individual colors. It seems like there should be a way to sample a color, and then assign that sampled color to the alpha channel. This is easy enough with an RGB multimatte, but can it be as easy with a wire color matte? I know it probably will not be as clean, but it would be a big time savings when you find out you need an unanticipated matte for a section of animation. Edited July 26, 2011 by Crazy Homeless Guy Link to comment Share on other sites More sharing options...
Crazy Homeless Guy Posted July 26, 2011 Author Share Posted July 26, 2011 It just dawned on me this morning.... Maybe I could use a rotoscoping method to key out the color in the matte, and then invert that to use it as a mask for adjustments? Similar to what you might do with a green screen. Link to comment Share on other sites More sharing options...
Crazy Homeless Guy Posted July 26, 2011 Author Share Posted July 26, 2011 (edited) Wouldn't you know it, ...one of my MultiMattes was turned off today, but I did have a wire pass, so I needed to use that to create a matte to adjust a color on a chair. It is funny how you can anticipate a problem, and then it happens. Solution: If you set a 'Color Key' effect on your Wire Pass, you can then sample a color in the wire pass. This color will then act as the alpha channel. Then create a adjustment layer just below the Wire Pass matte, and set the Track Matte to Inverted Alpha. Now you can make the necessary color adjustment based on the Wire Pass. Edited July 27, 2011 by Crazy Homeless Guy Link to comment Share on other sites More sharing options...
DoSe Posted August 2, 2011 Share Posted August 2, 2011 I love a conversation that's started and finished by one person, without any other interference, it's much neater this way.. I was just trying to do the exact same thing, and this works perfectly. Apologies for crashing your conversation crazy homeless guy.. D Link to comment Share on other sites More sharing options...
Crazy Homeless Guy Posted August 2, 2011 Author Share Posted August 2, 2011 I'm glad I didn't start arguing with myself. That might have been embarrassing. Link to comment Share on other sites More sharing options...
AubreyM Posted August 3, 2011 Share Posted August 3, 2011 I'm glad I didn't start arguing with myself. That might have been embarrassing. Maybe but it would have been entertaining. Link to comment Share on other sites More sharing options...
Fooch Posted August 23, 2011 Share Posted August 23, 2011 .. precomp it .. and possibly add a simple choker / matte choker to deal with the nasty edges. Simple choker does a good job smoothing out edges quickly. Anything can be keyed if you think of it as a greyscale image .. (for a luma key) Link to comment Share on other sites More sharing options...
Tommy L Posted August 23, 2011 Share Posted August 23, 2011 I'm glad I didn't start arguing with myself. That might have been embarrassing. Yes, you have to be careful. Like singing with headphones on. Link to comment Share on other sites More sharing options...
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