Why do my files have an extreme gamma shift when I select 32-bit floating point mode in After Effects?
This “gamma shift” is actually a re-linearization of the CineForm RAW file, returning the AVI from a 10-bit LOG source back to the original linear format (in this case though it’s not necessarily 12-bit linear, but rather has been expanded into a 32-bit floating point environment). For optimum results in a 32-bit floating point environment, you want to work with photometrically linear footage, not gamma-corrrected footage (or “video encoded”, which often has the misnomer of being called “linear”). This results in better image processing math and true real-world compositing operations that behave similar to natural-light phenomena. To get back to the original gamma of the image, apply a levels filter and adjust for a gamma of approximately 2.2.
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