> anyway, I think the "correct" scaling is at the very least objectionable. from a numeric point of view, it whould mix in gray, but from a visual poin of view

> anyway, I think the "correct" scaling is at the very least objectionable. from a numeric point of view, it whould mix in gray, but from a visual poin of view we do preceive the outer box as darker because non linearity in dislpay and perception. I can barely perceive a brightness difference between the two areas. Meanwhile, scaling the gamma-encoded image results in a severely wrong result where the outside is far darker than the inside.