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Alexa log-c prorez in win
Hi
Just today tested out the win version but I have a serious problem, the alexa originated prorez4444 footage shows 8bit color depth in all media information?
Anybody else tried?Thank You
Kaspar -
7 Replies
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Yeah I get this too on my win resolve 8.2 system (ProRes444 LogC quicktimes appears as 8 bit in the browser). I’m hoping its just a bug and its actually decoding 10bit in resolve, I haven’t noticed anything visually that would concern me as far as banding or any other “8 bit indicator”, so I’m assuming its just a broswer bin bug. Can someone from blackmagic pipe in on this though, I’m starting to feel a bit nervous all of a sudden!
Chris Hall
Colorist – Basher Films
Pasadena, CA -
Hi
Usually it is not that easy to spot it, I have been cut before by having QT decode wrong bit depth in other systems and working away fro quite a while before I understand what is wrong. I will try to render one of the clips to 8bit in AE and compare, will post tomorrow what I find out.
Thank You
Kaspar -
would love to know what you find out, let us know.
Chris Hall
Colorist – Basher Films
Pasadena, CA -
Hi
Late, but better than never….
The QT seems to be 8bit as I converted the file in AE to full range DPX and then applied same grade to both clips (lift -0.2, gain 2.2) I see definite loss of detail in gradations.To bad have to keep working on my hackmac
Kaspar
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Just to be sure repeated the same test under OSX and there is no loss of detail.
All this once again proves that 8bit can be very good source, it is not the bits but the quality of the image that will show artifacts.Kaspar
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Kaspar, really appreciate you looking into this. Thanks a bunch for doing that. Sad to hear the results though. Going to get blackmagic support on the phone tomorrow and let them know about this. I have 3 agency projects that contained alexa material that need to be redone on a mac system now… not happy about this… but then again that’s why they call it BETA, alas. Onward.
Chris Hall
Colorist – Basher Films
Pasadena, CA -
Hi
well the difference is minute, so unless You need pull keys from all-ready graded footage or You are not happy with some qualifiers in Your current grade, I would expect that nobody will see the difference. I had to apply very heavy contrast and the zoom in about 300% to see that some grain was missing. In 1:1 monitoring I could not spot it.
I would do a still from win system on single shot, take it to mac and split screen it – just to see if it is worth the hassle.Kaspar
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