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workflow problem

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Jef Huey
workflow problem
on Nov 22, 2009 at 5:35:49 pm

Hi All,

I am doing some workflow testing for a large HD project and have hit a snag. Sorry in advance for the long post, but the devil is in the details.

First my system specs: Mac 2x2.8 Quad Core, OS 10.5.8 10G ram.
AE 8.0.2.27
QT 7.6.2
FCP 7.01
Avid MC 4.0.2

Ok, on to it. I want to test color accuracy and quality for elements created in AE and passed to other systems.

To start I created a 1280x720 29.97 16 bit color comp (not color managed to start) with a black solid onto which I placed the basic 4-Color Gradient. I put a small scaling move on it.

I rendered this out with several codecs and brought them back into AE for comparison. The codecs were as follows:

dnx145
dnx220x
avid1-1x
prores
proresHQ
tif image sequence

To compare, I placed the imported files on separate layers above my original image. A rectangular mask was placed on the imported layer in the middle 50% of the image to allow a quick visual comparison. An adjustment layer was placed at the top of the comp with a curves effect set to crush the gamma to amplify any differences. I also did a difference matte comparison between the imported and original element.

The results were disappointing at best. In order of good to bad with respect to levels the list was:

tif image sequence - imperceptible level difference, perceptible banding increase on some areas.

avid1-1x - imperceptible level difference, much greater banding increase on the whole image (almost as if it were not 10bit).

dnx220x - perceptibly darker overall, banding similar but in different areas than original.

dnx145 - perceptibly darker overall, banding a bit more severe.

proresHQ and prores - significantly brighter overall (something must be wrong!), could not tell banding difference to due brightness increase.

Looking at the difference matte showed some interesting results, but as I am not totally comfortable in what it is telling me yet, I will ignore that for now.

But to the heart of the matter. Why are the ProRes levels so far off? I did some web searching and based on that I turned color management on to Rec 709 for the project and interpreted all imports as Rec 709. No difference.

I feel I must be doing something wrong in my workflow here. Any insight?

Thanks,

Jef


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Mark Walczak
Re: workflow problem
on Nov 25, 2009 at 5:51:55 pm

This seems like a pretty advanced post - well over my head. You may want to post this over at fxguide (http://www.fxguide.com). I know that Stu Maschwitz is heavily involved with color profiles/etc, so you may want to stop by his site (http://prolost.com/) and shoot him an email...

Hope this helps!

What makes you explode?
http://www.explosivegraffix.com


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Dave LaRonde
Re: workflow problem
on Nov 25, 2009 at 7:18:40 pm

This post by one of the COW's favorite guys at Adobe, Todd Kopriva, may give you the answer:

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


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


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