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Prores to H.264 color shift

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Pradip Patil
Prores to H.264 color shift
on Nov 15, 2011 at 9:08:41 am

I am trying to export my Prores 422 file to H.264 encoded Mov or Mp4 file. But the files are slightly rich in reds. I have used compressor as well as Mpegstreamclip for conversion.

This is happening first time to me. Herer is the screenshot with all the three files.



What's going wrong?

Pradip Patil
Mumbai,India


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Thomas Morter-Laing
Re: Prores to H.264 color shift
on Nov 15, 2011 at 9:33:16 am

I can't remember the specifics of H364, but if I remember rightly its colour space is typically 4:2:0- its a pretty awful codec for retaining things like color accuracy. However there are ways of encoding to higher profile versions such as 4:2:2 but I cant remember them... :s

:D
Tom Morter-Laing
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ross daly
Re: Prores to H.264 color shift
on Nov 15, 2011 at 2:35:18 pm

Hello!

Sadly, this is a known bug that has been around FOREVER. Here are some links that talk about it. The main consensus is that you can either shift the gamma before you compress it to offset the h264 shift, or there are some tweaks you can do to the converted file to make it appear correctly. Lastly, some people have had luck with the x264 codec. It is free.

Good luck!

http://byteful.com/blog/2010/07/how-to-fix-the-h264-gamma-brightness-bug-in...
http://forums.adobe.com/thread/769015


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Pradip Patil
Re: Prores to H.264 color shift
on Nov 15, 2011 at 3:40:53 pm

Thanks for replys.
I googled the issue and found a good piece of advice, thanks to shane ross. I was watching these files using quicktime player and that's where the problem was. I installed quicktime 7 and the file made from H.264 preset in Compressor looks perfectly fine.

Pradip Patil
Mumbai,India


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Pradip Patil
Re: Prores to H.264 color shift
on Nov 15, 2011 at 3:42:58 pm

[Pradip Patil] "I was watching these files using quicktime player"

I meant QuickTime palyer 10.

Pradip Patil
Mumbai,India


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David Roth Weiss
Re: Prores to H.264 color shift
on Nov 15, 2011 at 4:47:41 pm

Even with QT 7 you will still notice a gamma shift Pradip. The gamma filter in Compressor will allow you to make slight compensation adjustments, just be sure to use it lightly as a little adjustment goes a long way. And, test it with short clips, as it may take you a few attempts to get exactly the setting you desire.

David Roth Weiss
Director/Editor/Colorist
David Weiss Productions, Inc.
Los Angeles
http://www.drwfilms.com

Don't miss my new Creative Cow Podcast: Bringing "The Whale" to the Big Screen:
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Pradip Patil
Re: Prores to H.264 color shift
on Nov 15, 2011 at 6:06:44 pm

Thanks for the info David. For the time being, our requirements are met. I will definitely try what you have said. This particular project has been an eye opener about the 5D world. :)

Everything was so nice and easy till this project happened.

Pradip Patil
Mumbai,India


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