Exporting Premultiplied Alpha from Premiere

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I need to generate premultiplied alpha exports from a Premiere sequence. Recommendations on how to do this? If I generate ProRes 4444 w/ 16bpc+Alpha they are always Straight/Unmatted. In AE this is selectable, how do you switch to premultiplied in Premiere?

S

Sumeet_Kumar_ChoubeyCorrect answer

Adobe Employee

In Premiere Pro, you won't be able to export a video in Premultiplied alpha, but you can export ProRes 4444 in Straight alpha from Pr and then transcode it to ProRes 4444 Premultiplied alpha in After Effects. I hope it helps.

Thanks,

Sumeet

S

Sumeet_Kumar_Choubey

Adobe Employee

Hi bb28142042,

We're sorry about this. Currently, in Premiere Pro, you can't export premultiplied alpha in ProRes. You'll need to use After Effects for that.

Thanks,

Sumeet

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bb28142042Author

Participant

@Sumeet Kumar Choubey is there a different codec that supports premultiplied in alpha? Also, can you confirm if a straight/matted prores is exported from premiere and transcoded into premultiplied alpha using After Effects that it will be correctly premultiplied?

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R Neil Haugen

Legend

I don't think Premiere can create pre-multiplied alpha channels ... as that's been an irritation of a rather small group of highly technically experienced users for quite some time.

One always needs to go to Ae for that sort of thing.

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Everyone's mileage always varies ...

R Neil Haugen

Legend

I don't think it's an option in Premiere. Which it should be.

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Everyone's mileage always varies ...

bb28142042Author

Participant

does exporting a straight alpha from premiere and transcoding it in AE to a premultiplied alpha achieve the same result?

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