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Alpha channels in Speedgrade

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David Cabestany
Alpha channels in Speedgrade
on Dec 4, 2013 at 6:49:37 pm


Today I fiddled with Speedgrade for the first time, but I'm not sure if i missed a setting or Speedgrade can't read alpha channels.

I added several similar uncompressed clips to the timeline, all with a straight alpha channel, then I added a grading layer, did all the color correction in that layer and rendered to an uncompressed QT, I unchecked strip alpha.

When I added the newly rendered footage into premiere the alpha is gone and now I have a black background along with an ugly edge, same as if you look a Qt movie with an alpha directly in Quicktime (see attached).

So, my question is: how do I have Speedgrade to read and output the alpha channel before and after I color correct the footage?


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