@jdc, hi Jacques, a question please.
Suppose you have the neutral 45 degree CL line and consider a point with x value = N.
Now you lower the curve in this area so that for x=N, y is now 0.9N, say.
What happens to the C values for all pixels with luminosity N? Are they -
a) reduced by a factor, that is, a multiplication
b) reduced by a fixed value, a subtraction, and bounded to zero, or
c) something else!
Thanks.