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Symbiotic_ic reviewed on 21 May 2010
This is simply great software with excellent developer support.
Highly recommended.
[Version 1.2.8]

Symbiotic_ic had trouble on 20 May 2010
Great software! Love the new crf checkbox so I know exactly what I get vs. an analog slider.

My question: What exactly does the "Gamma 2.2" checkbox do?

Background: I have .MTS Panasonic TM700 footage converted to ProRes, editing in Final Cut. The video looks good until I export using "Quicktime Conversion." Using x264 I set nclc=111 (HD) and my output file looks too dark in QuickTime X, QuickTime 7, Movist, VLC. Also if I convert after to a .mkv container (Mkvtoolnix) it's still dark. (meaning it's not just a container error) Setting nclc=111 AND checking the gamma2.2 checkbox fixes the problem.

My problem: I'm scared by checking gamma2.2 I'm actually making a mistake by artificially forcing lighter footage and there's an error somewhere else in my flow. (like user StarHawk79 had) ProRes has native 2.2 gamma, so I don't understand why FCP exports darker footage. I'm on Snow Leopard (10.6.3) / Intel so OS gamma is now 2.2, FCP v7.0.2. I notice if I export to another codec (say Prores Proxy) it's also darker, and I can't fix it. I'm not sure where the problem is.

Thanks in advance!
[Version 1.2.8]

2 Replies


Symbiotic_ic commented on 21 May 2010
Thank you for your quick and helpful response!

You confirmed what I was thinking: I shouldn't have to use the gamma 2.2 checkbox with Pro apps. I think I found the problem: it's Final Cut Pro. If I use MPEG Streamclip or Compressor to convert ProRes to x264 then the video looks good just by setting nclc=111. If I use FCP "Export Quicktime Conversion" then the video is dark unless I also check "gamma 2.2." I'm guessing it's a FCP bug.

So my solution is always to Send FCP video to Compressor for conversion with x264.

Thanks again! And I'm really looking forward to when those blu-ray settings are debugged and working by the x264 team.

Symbiotic_ic replied on 29 May 2010
Good point Bluestar, and I attributed the slight color shifts I'm still seeing to this effect. But that's interesting that you needed to brighten footage destined for computer playback. I have to honestly say my last comparisons (admittedly on only 2 scenes) looked so close pre and post-encode that I determined no gamma adj. was necessary. I verified it on 10.6 with a couple of different viewers. (VLC, QTX, Movist) Maybe our setups are different? (I don't have Perian installed, but did at one time and I think that had an influence)
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