avutil/color_utils: Add basic transfer functions for each AVColorTransferCharacteristic
Most functions are valid over a domain and range of [0.0-1.0] but
some are defined over greater. This patch does not deal with
AVColorRange and assumes AVCOL_RANGE_JPEG for the returned values.
Signed-off-by:
Kevin Wheatley <kevin.j.wheatley@gmail.com>
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