Video layer anti-aliasing at the edges when mask is applied

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Level 1

145 points

Video layer anti-aliasing at the edges when mask is applied

A mask (made from a shape) if causing an odd problem with the video layer it is masking. It is causing the edges of the video to antialias. The odd part is that even edges far from the edges of the mask (sides and bottom in this example, are antialiasing to semi transparent. If I turn off the mask, the edge problem goes away. In the example below I have used Photoshop to show a 1600% enlargement of the issue. The pixels at the edge of the video have turned transparent revealing the red layer below.

Any ideas whey this is happening and how I can fix it?

Posted on Nov 12, 2013 12:09 PM

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Answer 1

fox_m

Level 6

13,250 points

Nov 12, 2013 2:39 PM in response to Tracy E

Try setting your Canvas Render setting to Best (or Custom with all options turned on.) If you're exporting that media to video from Motion, you should make sure that is the setting upon export as well.

Normal looks very good most of the time, but it is still a little less "precise" than Best.

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Answer 2

Tracy E Author

Level 1

145 points

Nov 12, 2013 2:40 PM in response to fox_m

Thanks Fox, but I am rendering at best already.

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Answer 3

fox_m

Level 6

13,250 points

Nov 13, 2013 2:39 PM in response to Tracy E

Is the Outline turned on for the shape? Is it blurred? Are you using Luminance for the mask and an outline of a different brightness? Is there any Feathering and/or Falloff (falloff alone will affect a few pixels around the edge)?

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Answer 4

Tracy E Author

Level 1

145 points

Nov 13, 2013 5:52 PM in response to fox_m

None of the above. The really odd part is that this is not happening at the edge of the mask. It is happening at the edges of the video that is masked, which is far from the edges of the mask itself. You can see in the picture that the mask edges (red box) extend well beyond edges of the screen.

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