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a bit of clarity on edge mattes

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a bit of clarity on edge mattes
by Serge Marcotte (SSGGMM) on Jan 18, 2008 at 2:36:33 pm

I built the finest track matte I could with my dvcpro50. It's not going to get any better (new to the process, still tinkering) I'd like to blur the hard edges into the background plate.

As I understanding it, I need an edge matte, one that overlaps BOTH foreground and background by a pixel or two (This is not a matte blurring operation.) What's the best way to obtain said edge matte? (Or do I have it all wrong to begin with?)



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Re: a bit of clarity on edge mattes
by Darby Edelen on Jan 18, 2008 at 6:05:56 pm

You can create an edge matte for an image in many different ways. What I would suggest is duplicating your matted footage, applying a Channel > Shift Channels effect with these properties:

Alpha -> Full On
Red -> Alpha
Green -> Alpha
Blue -> Alpha

Then apply a Stylize > Find Edges effect and Invert it. This should give you a basic edge matte, from here you can blur it slightly and use Color Correction > Curves, Color Correction > Levels or Channel > Minimax to increase/decrease the range of the matte.

Darby Edelen
Designer
Left Coast Digital
Santa Cruz, CA

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Re: a bit of clarity on edge mattes
by Serge Marcotte on Jan 18, 2008 at 6:28:14 pm

Will try. Thanks very much.



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