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Grading QT Gamma
I do my color grading in Premeire Pro, in a Rec 709 color space then export with the QT Gamma Compensation LUT. Premeire recently came out with the option of working in a QT Gamma space so you don’t have to use the LUT on export. My question is this… when grading in a QT workspace, what is the correct IRE reference for skin tones? When I go by the usual Rec 709 standard of 70 IRE for white skin, it really looks awful. Is there a different set of standards for the 1.96 Gamma range?
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2 Replies
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The IRE reference for white skin in the QT Gamma color space is indeed different from the standard Rec 709 reference of 70 IRE. This is because the QT Gamma color space is designed to be more closely matched to the characteristics of film stock, which has a different appearance than what you would expect in Rec 709.
To be able to accurately grade skin tones in the QT Gamma space, it’s important to use the correct reference points and to calibrate your monitor accordingly. Here are some general guidelines for grading skin tones in the QT Gamma color space:
– For white skin, use the IRE reference around 66-68
– Medium Skin woukd have IRE around 60-62
– For extreme dark skin tone, use IRE reference around 53-55.
Feel free to experiment with these tones to see which options are the best for you!
It is important to note that these are rough guidelines, and the best way to ensure accurate grades is to use proper calibration tools and software. You can use a colorimeter or spectroradiometer to calibrate your display, and there are also professional-level grading software packages available that can help you achieve the highest level of accuracy possible.
Hopefully this helps! Please let me know if you have any other questions.
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Thanks, Hector. I will try that out.
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