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Old March 24th, 2010, 07:41 PM   #1
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DNxHD shifting color & contrast

I transcoded some footage for the first time from H-264 to Quicktime using NDxHD at 10 bit 25fps It all converted quickly and easily however/
The exposure drops about a half stop
The contrast drops and my blacks are no longer black. The picture starts to look muddy.
The color shifts a little to yellow/green cast

I converted the file at all different settings and arrived at the same final result in each case.
The shots before and after were compared side by side in both Quicktime windows and on a CS4 timeline with the same results.

I've now heard reports that this a normal problem that users live with and simply correct.

True or False?
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Old March 24th, 2010, 10:10 PM   #2
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I would imagine this is a colour space issue. DNxHD is designed to be viewed in a Rec 709 color space, h.264 in a RGB color space. Also if you are working with Quicktimes (i imagine you are?) then that can be an added complication in terms of Quicktime related gamma issues...

Basically, there are a number of interactions going on that make seeing things they way you need to be complicated using your workflow, unfortunately.
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Old March 26th, 2010, 11:19 PM   #3
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What's the solution?
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