DNxHD & Windows/Mac Issues

Gamma-shift issue:

  •  http://forums.creativecow.net/thread/8/1028870
    • “QuickTime movie, created with Avid on a PC, using the DNxHD codec. When I open it in QuickTime Player on a PC, the colours are fine, but when I import it into Final Cut on a Mac, the colours are a lot brighter- gamma shift”.
    • I have ProRes and DNxHD clips of the same thing on the timeline. When I switch from a frame in one clip to the same frame in the other clip, there is a very visible difference between the two. The DNxHD version is brighter and ‘milky’.  I’ve tried exporting DNxHD from Final Cut and it has the same problem as the DNxHD sourced from the Avid.”
    • “It’s the codec. DNxHD reports RGB values to FCP not Y’CbCr. Therefore FCP applies its internal RGB interpretation which causes the gamma shift you see.”
    • “Any non native codecs to final cut pro should be transcoded first through compressor; best way to check if the gamma has shifted is take an image with tonal ranges which vary over a gradient e.g. sky; look at the scopes in avid for the dnx file; look at the scopes in final cut pro for the dnx file; no guess work”
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