QC for image not filling timeline frame edges

I have a question on how to best catch some re-framing issues, especially where a clip has been rotated or stabilized, or we have switched a project timeline from HD to 4k DCI, and for example some of the clips are not reaching all the way to the edge of the new DCI space. My idea was to put a color generator on the bottom video track and make it red, and then if the image did not reach the edge of the frame I would see a sliver of red showing. However, I have realized that it only shows red if all 4 edges of the image are not touching the edge of the frame/container- if 2 are touching it stays black. Is there a better method to catch if a corner or just one edge is not filling the entire space of the frame? Thanks!

C

There is a preference setting to use grey instead of black for viewer frames. This contrast difference should make the video edge easier to see.

Excellent question.

I used to try to put a red solid color generator underneath everything, but realized that the viewer doesn’t display that reliably.

Instead, you can generate a totally vanilla LUT, just something that bypasses everything, but then change one of the 0, 0, 0 values to 100 and set that modified LUT as an output LUT.

So, changing 0, 0, 0 to 1, 0, 0 turns all the black pixels red; changing 0, 0, 0 to 0, 1, 0 turns the black pixels green; and changing 0, 0, 0 to 0, 0, 1 turns all the black pixels blue.

By setting it to the output LUT, you catch everything in the entire signal path. Careful though—there can be false positives depending on the resolution of the LUT and your media. Also, it will turn any pixels in the body of the image black, so just use it as a check, but don’t render with it.

More info here: https://www.liftgammagain.com/forum/ind ... post-95944


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