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ProRes 4444 Gamma shifts in FCP but not After Effects

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Byron Nash
ProRes 4444 Gamma shifts in FCP but not After Effects
on Feb 6, 2012 at 10:40:07 pm

I have a shot that was exported from 4444 to 4444 to be used in a VFX shot. The exported shot right from Final Cut does not match what the source was. When I compare the two, there is a definite shift in gamma. What I rendered out of After Effects matches what was exported from FCP but not the original source. However, if I bring the original and exported clip into After Effects they match.

I have tried the QT7 color preference both ways and see no difference.

Byron Nash
3D Artist
http://www.editatjoes.com


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Michael Gissing
Re: ProRes 4444 Gamma shifts in FCP but not After Effects
on Feb 6, 2012 at 10:47:28 pm

I have seen the same thing going from Color to FCP with 4444. The shift was to flatten the gamma slightly. In the end I just added a gamma filter in FCP and increased the contrast slightly. It wasn't perfect but close.

If you don't need the alpha then use Standard ProRes or HQ which doesn't have a gamma shift in my experience.


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Byron Nash
Re: ProRes 4444 Gamma shifts in FCP but not After Effects
on Feb 6, 2012 at 10:54:50 pm

The source footage is 4444 and we are trying to maintain the color fidelity throughout the pipeline.

Byron Nash
3D Artist
http://www.editatjoes.com


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John Pale
Re: ProRes 4444 Gamma shifts in FCP but not After Effects
on Feb 6, 2012 at 11:19:05 pm

I think I remember a lengthy post about this awhile back (maybe from Gary Adcock? Sorry, don't remember for sure)

ProRes 4444 can be RGB or YUV, but its not user selectable. Its automatically selected. There may be an issue where in certain instances it gets it wrong.


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Byron Nash
Re: ProRes 4444 Gamma shifts in FCP but not After Effects
on Feb 7, 2012 at 2:22:58 am

I think I found the thread you were referring to about YUV/RGB. Sounds like taking 4444 back to FCP isn't going to work due to the color shift. I left a tiff sequence rendering overnight, I'm not sure if that's going to help me or not but it was worth a longshot. We have done this workflow before successfully, I wonder if the files started off RGB last time we did the clean round trip? Is there any way to tell if the 4444 is YUV or RGB?

Byron Nash
3D Artist
http://www.editatjoes.com


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Rafael Amador
Re: ProRes 4444 Gamma shifts in FCP but not After Effects
on Feb 7, 2012 at 2:40:30 am

[Byron Nash] "I think I found the thread you were referring to about YUV/RGB. Sounds like taking 4444 back to FCP isn't going to work due to the color shift. I left a tiff sequence rendering overnight, I'm not sure if that's going to help me or not but it was worth a longshot. We have done this workflow before successfully, I wonder if the files started off RGB last time we did the clean round trip? Is there any way to tell if the 4444 is YUV or RGB?"
PR444 is up to what the application renders.
Color (AE same) renders in RGB so the output Prores are RGB.
I said may times that PR444 is an unfinished codec. RGB or YUV should be selectable (also Full range/Video range).
There is not a clear way to convert a PR444 RGB to PR444YUV. I guess you can do it in FCP rendering in High Precision.
The Gamma issue might be a software version issue. Lately I haven't heard of complains about gamma when exporting graphics in PR444.
BTW, do you have installed QT.7?
rafael

http://www.nagavideo.com


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Byron Nash
Re: ProRes 4444 Gamma shifts in FCP but not After Effects
on Feb 7, 2012 at 2:41:58 pm

Walked in this morning and the editor said it's working now. The sequence was 422HQ, changing it to 4444 fixed the issue. Duh...

At least now I know all about ProRes RGB vs YUV color space! Thanks for the help everyone.

Byron Nash
3D Artist
http://www.editatjoes.com


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Rafael Amador
Re: ProRes 4444 Gamma shifts in FCP but not After Effects
on Feb 7, 2012 at 3:34:38 pm

[Byron Nash] "Walked in this morning and the editor said it's working now. The sequence was 422HQ, changing it to 4444 fixed the issue. Duh.."

If you just cut and export without any rendering you will be getting Pr444 10bRGB, but whatever you render in that sequence will be crunched to 8bRGB.
rafael

http://www.nagavideo.com


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