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AE CS5 to Media Composer 4 Gamma Shift

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Jonah Walker
AE CS5 to Media Composer 4 Gamma Shift
on Jul 9, 2010 at 4:08:58 am

I am running AE CS5 on Snow Leopard and the Media Composer is on Leopard. The footage is XDCAM, and is exported by avid as a QuickTime same as source. I did the compositing and the footage when re-imported into AVID, the gamma has shifted to be significantly darker than the original footage. I was exporting lossless as Animation Codec.

The footage looks correct when viewed in QuickTime, but is very dark in AVID. I decided to try other codecs and tried Uncompressed 10 bit, AVID DX HD in RGB and YUV, and AVID 1-1 in RGB and in HD and all had the shift, though the YUV seems to have shifted more than the RGB.

Could this have something to do with the Gamma Shift from 1.8 to 2.2 in Snow Leopard? Is anyone else seeing this issue? Any help would be greatly appreciated.

- Jonah Lee Walker

Video Editor, After Effects Artist
http://www.whaleofatale.net


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Dave LaRonde
Re: AE CS5 to Media Composer 4 Gamma Shift
on Jul 9, 2010 at 2:05:13 pm

[Jonah Walker] "Could this have something to do with the Gamma Shift from 1.8 to 2.2 in Snow Leopard? Is anyone else seeing this issue?"

My guess is that a LOT of people have the problem, and that you've pegged it: it's the gamma. This should provide you with a how-to:
http://help.adobe.com/en_US/AfterEffects/9.0/WS44E9CED2-117D-4c19-879E-D553...

If you happen to run both Avid and FCP on the same machine, it could also be a ProRes issue:
http://blogs.adobe.com/toddkopriva/2009/12/prores-4444-colors-and-gamma-s.h...

And if you happen to run Avid, FCP and the newest AE version, here's more:
http://blogs.adobe.com/toddkopriva/2010/05/prores-4444-and-prores-422-in.ht...


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


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Jonah Walker
Re: AE CS5 to Media Composer 4 Gamma Shift
on Jul 9, 2010 at 3:33:11 pm

Yea, I figure it is the gamma, though most of the posts have been about problems with Final Cut Pro, and not problems with AVID.

And while I have already changed the ProRES tags so they have the gamma, the question then arises do I need to change the other tags, like tags for AVID files or Uncompressed or Animation codec so that it will write the gamma tags into those? And if that is the case is there a post someplace that lists what the tags are so that I can go in and add Gamma tags to all of those?

- Jonah Lee Walker

Video Editor, After Effects Artist
http://www.whaleofatale.net


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Dave LaRonde
Re: AE CS5 to Media Composer 4 Gamma Shift
on Jul 9, 2010 at 3:50:31 pm

Y'know, I bet they'd know on the COW's Avid user forum. Very few people here mess with Avid -- I'm n FCP guy myself -- so you'd wait forever for an answer. But someone on the Avid forum no doubt contends with AE almost on a daily basis.

I'd ask about it there.

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


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