FYI... the golden value in FG.BG separation is the single pixel bleed between the two. Unless the new background is of the same value as the old, then this woul

FYI... the golden value in FG.BG separation is the single pixel bleed between the two. Unless the new background is of the same value as the old, then this would show up as a light or a dark fringe. At erode filter can remove this in hard-edged objects, but an erode would destroy fuzzy objects like hair. This is why compositors often separate soft and hard selections.