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Gamma shift between FCP and Motion

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Tom Bridges
Gamma shift between FCP and Motion
on Jan 12, 2006 at 6:35:17 pm


I'm getting big gamma shifts when moving between Motion and FCP (using all kinds of codecs). I know it's down to the difference between RGB and YUV colourspace, but there's got to be a workaround, right? Otheriwse there's no point providing integration with Final Cut! Or do I really have to render out to Animation, then render in Final Cut?

Any help really appreciated!

Thanks,

Tom

Split Image
http://www.split-image.co.uk


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Noah Kadner
Re: Gamma shift between FCP and Motion
on Jan 12, 2006 at 6:42:22 pm

I would suggest rendering out lossless from Motion- it's a time saver in the long run.

Noah


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Tom Bridges
Re: Gamma shift between FCP and Motion
on Jan 12, 2006 at 6:51:04 pm


Hey thanks Noah - that was a quick response!

But it's basically broken, right? We've been banging our head against the wall all day. We've ended up just rendering to a 10bit RGB format (AJA) and using a RGB timeline in Final Cut. It's a graphics-only project.

A shame - it's a nice idea to have that kind of integration with Final Cut. Just a pity about the implementation ...

Thanks,

Tom

Split Image
http://www.split-image.co.uk


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Noah Kadner
Re: Gamma shift between FCP and Motion
on Jan 12, 2006 at 7:04:02 pm

Why RGB? You need to be in YUV space in FCP to avoid these sort of shifts. It's nothing to do with the integration and everything to do with the settings.

Noah


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Tom Bridges
Re: Gamma shift between FCP and Motion
on Jan 12, 2006 at 7:08:39 pm


That's strange. We were getting the shifts moving from YUV (AJA 10-bit timeline) to RGB and back again. We moved to a 10bit RGB timeline in Final Cut which has solved all our issues.

What codecs do you use to avoid getting a shift?

Thanks,

Tom

Split Image
http://www.split-image.co.uk


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Jeff Bernstein
Re: Gamma shift between FCP and Motion
on Jan 18, 2006 at 10:59:12 am

Tom is correct in keeping things in RGB. Apple has a real mess on their hands as it relates to RGB-YUV conversion. They basically decipher Gamma incorrectly. To avoid it, the best method is to use Tom's method.

FCP is not required to use its YUV mode unless you are looking to perform any time of effect. Since Tom was simply using FCP to laying graphic elements, I think he will be just fine.

If you are less than thrilled about this workaround, and who wouldn't be, I suggest a hike over to this url http://www.apple.com/feedback/finalcutpro.html


Jeff Bernstein

Digital Desktop Consulting
Apple Pro Video VAR
XSAN Certified

323-653-7611


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