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Black level after export are crushed
I’ve been testing out DaVinci lite and everything looks fine inside the application. When I export (to ProRes 422) the black level of the exported files are much lower than when monitoring the level on the waveform inside DaVinci and the blacks in the exported files are crushed, even though it has fine detail inside the app. Am I using wrong color space (I am using Davinci RGB) or something else?
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8 Replies
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export uncompressed for test and see what happens?
prorez is the one that gives you insanity on other apps.
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Margus
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Same thing happens when exporting Avid DNxHD.
I need to do some gamma corrections in Avid to make it look similar. Any solution anyone? -
Did you work and render in the same legal space? Unscaled/Scaled?
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When exporting to ProRes 4444 the black level looks fine so it must be the rendering to ProRes 422 that is the problem. Rendering to ProRes 422 (HQ) is crushing the blacks as well.
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Quite likely its the difference between full scale RGB and legal linear 709 video.
ProRes4444 especially is a questionable choice for swapping between systems as it can contain either RGB or Y’CbCr media, and there are applications which won’t know which — unless you deliberately flag it as such. When you say the blacks are “crushed”, I’d also bet that your whites are well below where they should be. This is a result of plotting 94-940 (0-100 IRE) as if they were 0-1023, which will result in severely negative black. The opposite also occurs, and people complain about flat, milky values.
These issues are painfully obvious in scopes.
jPo
You mean “Old Ben”? Ben Kenobi?
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The whites of the ProRes 422 are actually higher than they should be as well (like 8% higher when monitoring in FCP) so the whole spectrum is kind of stretched). Is there a solution to this if this is caused by wrong IRE information?
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[Spazz Nielsen] “Is there a solution to this if this is caused by wrong IRE information?”
There is an option in Resolve (right click on the clip in Conform) to change the applied scaling.
jPo
You mean “Old Ben”? Ben Kenobi?
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Hi,
Do you export and view it in an another application like Avid? Or are you comparing the gamma values in QT-player? That will obviously mess everything up.
Problem with Avid is that no method works. With regular dnXhd-export, databasebuilding – there is no way the gamma will be perfect. In this case it does not matter if you choose to read the files as unscaled or normal scales video. Its an Avid issue.
You need to put a gamma corrector on a top layer to compensate.I do listen if anyone has a better solution?
The best way to check the files is to import them to After Effects, Smoke or Flame.
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