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Dennis points out that `there definitely *is* no right answer for
BT.709 gamma' and `your formula [the DCP-o-matic v2 gamma function
before this commmit] is what I'm calling the inverse of the BT.709
camera transfer function. The EBU would not have bothered to write:
"Therefore the monitor gamma is not, and never has been, the inverse
of the camera gamma." if no-one ever thought of using it'.
At least the 2.2 gamma of v1 should not surprise anybody.
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