Andrew Haley wrote:
sRGB data is (a function similar to) raising to the power 2,2,
so to go from linear RGB to sRGB is
Math.pow(x/255, 1/2.2) * 255
When light levels are very low the transfer function is very nonlinear, so
errors will be high. That's true of both lcms and Kodak, but in my opinion
lcms is doing a better job in this case.
sRGB defines a linear section of the transfer curve for very low light
levels.
If you want to have new tests for sRGB/lRGB fidelity, you should use the
equations in the ISO standard.
Jerry
