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Color Bit Depth Question

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Michael W. Towe
Color Bit Depth Question
on Apr 22, 2013 at 11:52:11 pm

I just received some broadcast specs for a client of mine which is requiring delivery to Aberdeen. Their spec sheet calls for ProRes 422 LT which is not a problem, but they want a bit depth of 8bit. The footage for the project is being shot in ACVIntra 100 at 10bit. I am assuming that when it goes on the timeline in X it preserves the 10 bit color space. Is there a way to force the timeline to an 8bit color space in X?

Thanks in advance,

Michael W. Towe
President M2 Digital Post
http://www.m2digitalpost.com


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Mark Smith
Re: Color Bit Depth Question
on Apr 23, 2013 at 12:18:14 am

Pro Res LT is 8 bit . I think by exporting a pro res lt file from your AVC I time line, you will have arrived at an 8 bit file.


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Michael W. Towe
Re: Color Bit Depth Question
on Apr 23, 2013 at 1:21:11 am

Excellent! I was under the impression that all PreRes respected the original bit depth. In this case I am happy I was wrong!

Thanks again!

Michael W. Towe
President M2 Digital Post
http://www.m2digitalpost.com


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Jeremy Garchow
Re: Color Bit Depth Question
on Apr 23, 2013 at 2:34:10 am

All flavors of ProRes are 10bit.

There's no way that I know of to force an 8bit render in fcpx.

I'm sure there'll be fine with your ProRes LT file.

Send a test file for compliance.


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Michael W. Towe
Re: Color Bit Depth Question
on Apr 23, 2013 at 4:14:41 pm

Aaaaaand once again the internet strikes back with contradictory information. I'm going with the 10 bit answer as that's what I originally thought it was, and Wikipedia confirms this and we all know Wikipedia is never wrong. I'll be running some tests with Abredeen as well since this is the first time using them. I'll report back with the results.

Mike

Michael W. Towe
President M2 Digital Post
http://www.m2digitalpost.com


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Jeremy Garchow
Re: Color Bit Depth Question
on Apr 23, 2013 at 4:50:59 pm

Apple has a white paper about ProRes: http://images.apple.com/finalcutpro/docs/Apple_ProRes_White_Paper_October_2...

Jeremy


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Michael W. Towe
Re: Color Bit Depth Question
on Apr 23, 2013 at 4:57:59 pm

That settles it, it's 10bit. Thanks Jeremy this is a great resource,

Michael W. Towe
President M2 Digital Post
http://www.m2digitalpost.com


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Erik Lindahl
Re: Color Bit Depth Question
on Apr 24, 2013 at 6:12:57 pm

I thought ProRes 4444 was 12-bit video and 16-bit alpha.

Apple ProRes 4444 supports image sources up to 12 bits and preserves alpha sample depths up to 16 bits. All Apple ProRes 422 codecs support up to 10-bit image source

The above is from Apple.


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gary adcock
Re: Color Bit Depth Question
on Apr 25, 2013 at 1:45:36 pm

[Erik Lindahl] "Apple ProRes 4444 supports image sources up to 12 bits and preserves alpha sample depths up to 16 bits. All Apple ProRes 422 codecs support up to 10-bit image source"


Let us not forget that you do not magically gain bit depth by using a 10 or 12bit codec in post when you shoot 8bits in camera. While the conform between color spaces is vastly improved, unless you are manipulating the original image, most users will not see the difference, it is very noticeable on a vectorscope.

gary adcock
Studio37

Post and Production Workflow Consultant
Production and Post Stereographer
Chicago, IL


Follow my blog at http://www.garyadcock.com

Or follow me on Twitter
@garyadcock




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