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POwens
Inspiring
March 6, 2023
Answered

How to export caption track with alpha?

  • March 6, 2023
  • 1 reply
  • 4726 views

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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Correct answer POwens

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

1 reply

Ann Bens
Community Expert
Ann BensCommunity Expert
Community Expert
March 6, 2023

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

P
POwensAuthor
Inspiring
March 6, 2023

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

Stan Jones
Community Expert
Stan JonesCommunity Expert
Community Expert
March 8, 2023

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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