How to export caption track with alpha?

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I have a fully-subtitled feature doc to turnover to finishing, and the vendor is requesting the subtitles as a separate TIFF sequence with alpha. So - how to export a TIFF sequence? I can export the sequence as a separate ProRes file with only the captions, of course, but can I get an alpha channel into that? I presume they can always luma key it, but wondering if it's possible to do as requested?

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POwensCorrect answer

Inspiring

Yes, the XML conversions were a great method, but this is a big step in the right direction.

Stan

Well, this worked a treat. Convert to text, send to ME, export as QT > ProRes 4444 8bit + alpha - worked as desired. Thank you Stan

Ann Bens

Community Expert

If you want a tiff sequence you need to send your timeline to AME and export the old-fashioned way.

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POwensAuthor

Inspiring

OK, thanks for that. But what about the alpha channel - is that automatically part of the export?

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Stan Jones

Community Expert

Following up. This isn't practical, as each frame is 8MB, so at UHD, the group of TIFF files would be a few terabytes LOL. Trying the ProRes approach, I turned off all video tracks except the caption track and tried exporting the caption track instead as ProRes 4444 out of AME, but the result is just black video - the captions do not export. What am I doing wrong here?

Captions are not graphics text as such, and I do not believe they can carry an alpha channel.

"Upgrade Caption to Graphic," was introduced with PR 23.1 - Dec 2022. Here is the What's New:

https://helpx.adobe.com/premiere-pro/using/whats-new.html

Select one or more captions, and PR converts them to graphics text and moves them to a video track.

If you want to also keep your captions, duplicate the caption track before you convert one of them.

Stan

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