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Final Cut gamma shift for Photo-JPEG
Hi guys,
Here’s the problem I’m facing right now:
I have HDV 24p footage (from Canon HV20). I captured and converted to 24p as per Apple’s official workflow (https://support.apple.com/kb/HT2410). I did conversion in Compression for same clips using two codecs: Apple ProRes and Photo-JPEG.
The first problem: Apple ProRes footage is darker than original. (on the contrary Photo-JPEG is the same as the original footage).
The second problem: When I import the footage to Final Cut Pro, in case of ProRes I get the same darker picture, but when I import Photo-JPEG I also get the picture darker than if I open the same footage in Quicktime.
I have a problem understanding where is this gamma shift is coming from and what can be done about it? (i’m working on one monitor).
Thank you in advance.
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2 Replies
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Hi David,
PhotoJPEG is YUV or RGB depending of the quality you set on exporting. I know that if you export 100% quality, is RGB. I know that if you export 75% is YUV 422. But I don’t know about the in-between values.
This can be producing the gamma Shift.
BTW where are you seeing the Gamma Shift? IN FC, QT Player?
rafael -
I know that if you export 100% quality, is RGB. I know that if you export 75% is YUV 422.
From Compressor I have arou 95-98% quality in Photo-JPEG.
BTW where are you seeing the Gamma Shift? IN FC, QT Player?
The shift is visible only in FCP and when rendered out of it. Other than that Photo-JPEG footage from Compressor plays with same as native gamma in QT.
But when I export HDV from Compressor with ProRes in both QT and FCP I get shift to the darker side.
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