--- Colin Maddock <cmaddock@clear.net.nz> wrote:
> The blacks need to be neutral before the whites are adjusted.
That is one thing I was always wondering about. When I use the factory
settings of my Sony 400PS and turn up contrast to 100% the blacks have
a red cast. The factory settings for 6500K are
Bias: 56(R), 61(G), 41(B) and
Gain: 91(R), 83(G), 67(B).
Reading through the documentation of PhotoCal by ColorVision it seems
PreCal does not make any adjustments to the blackpoint but only the
whitepoint. Did I get something wrong here?
Also Nuno Sebastião has pointed out that bias should be 0 and gain
should be 1. I would assume that a bias value of 50 represents an
effective gain of 0 in order to make negative and positive adjustments.
Now applying the same to gain I would also expect numbers around 50.
Obviously, this is not the case but all numbers are way above 50. So
what is bias and gain really?
Thanks,
Robert
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