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Avoiding Gamma Shifts Between FCP & AE?

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Tim WardAvoiding Gamma Shifts Between FCP & AE?
by on Feb 25, 2010 at 10:11:42 pm

What are some of the best ways to take video captured in FCP, effect it in AE, then back to FCP while maintaining the same gamma levels? Also, can you maintain the super-white information when round-tripping? I do understand the differences between YCbCr and RGB color spaces.

FCP 6.0.6
AE CS3
QT 7.6.2
Mac OS 10.5.8
Kona LHe
Tek 1760

Thanks!
Tim


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Dave LaRondeRe: Avoiding Gamma Shifts Between FCP & AE?
by on Feb 25, 2010 at 10:23:54 pm

That super white stuff just creeps me out.. but then, I'm a broadcast guy where illegal video levels are a BIG no-no.

Try giving the bottom part of this page a good, detailed read...

http://help.adobe.com/en_US/AfterEffects/9.0/WS44E9CED2-117D-4c19-879E-D553...


Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Tim WardRe: Avoiding Gamma Shifts Between FCP & AE?
by on Feb 25, 2010 at 10:41:42 pm

Oh, I just want the super-whites because it gives me more to play with. They don't go out for broadcast that way!

I've read that Adobe article before, but it hasn't really helped me (my brain may just be mush). the legacy Quicktime option doesn't make it any better. The gamma on the AE-rendered video still won't match the gamma of the FCP video, as shown on my WFM. I've done round-trip tests with the Black/White ramp generator in FCP, and can never get them to match up without applying a Curves filter in AE to compensate.


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Dave LaRondeRe: Avoiding Gamma Shifts Between FCP & AE?
by on Feb 26, 2010 at 12:15:50 am

Well, since you haven't said what codec you're using in FCP, all I can do is direct you here:

http://blogs.adobe.com/toddkopriva/2009/03/prores-422-colors-in-after-eff.h...


.....and here:

http://blogs.adobe.com/toddkopriva/2009/12/prores-4444-colors-and-gamma-s.h...


Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Tim WardRe: Avoiding Gamma Shifts Between FCP & AE?
by on Mar 1, 2010 at 8:38:10 pm

I've gotten swamped and haven't been able to do what I need to do to get to the bottom of this, but I started my render tests over (since I can't remember exactly what methods I did a couple months ago). Codecs involved are DV25, DVCPRO50, ProRes D1, 8/10-bit Uncompressed D1. I'll report back soon with additional information and results.

Tim


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Tim WardRe: Avoiding Gamma Shifts Between FCP & AE?
by on Jun 1, 2010 at 4:39:24 pm

This seems to be the resolution:

http://forums.creativecow.net/thread/8/1017959


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Tim WardRe: Avoiding Gamma Shifts Between FCP & AE?
by on Jun 1, 2010 at 4:44:37 pm

Removing the legacy AJA uncompressed codec, that is.


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