AddMix Function Example: In this tree, we pull a key on the foreground with KeyLight. We then attach the foreground (bs - that, uh, stands for Blue Screen...) with the background tree. Looking at the Closeup illustrations, the first one shows the default result, a result identical to an Over node. We can see ringing problems both along the hair (a bright ring) and along the shoulder (a dark ring). Through adjustment of the curves, we dramatically reduce the ringing, giving a much cleaner composite.
Given that the curves can dramatically alter opacity of the foreground, you may be obliged (I picked that one up in France...) to make sure the interior of the matte really is 100% opaque through the use of additional masking, garbage mattes, etc.
image AddMix( image Foreground, image Background, int clipMode, int preMultiplied, float fgExpr, float bgExpr );
image AddMix( Foreground, Background, clipMode, preMultiplied, fgExpr, bgExpr ); See Also |
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