Hi William,
William Skaggs wrote:
(1) Layer A1 is visually identical to layer B1. (2) Layer A2 is visually identical to layer B2. (3) When layers 1 and 2 are composited in "Add" mode, the two images look different.
This can happen because of the nonlinearity in color profiles.
I can see that this would happen; I don't, however, consider that to be a major problem, because you'd be able to see with more accuracy than at present what the result would be!
It would be a real can of worms not to use the same color space internally for all images -- losses in conversion are not an important enough factor to overcome this. (But there is a reasonably strong case for allowing choice as to which color space is used internally.)
I beg to differ!
A silently applied destructive change to the image data is in my opinion a very important factor!
All the best, -- Alastair M. Roobinson
