I came across a technique unknown to me to get rid of hair fringes left when extracting hair from a white background and compositing into another one.
The original was shot against a white BG.
On the first picture, it's a rough 1st pass selection.
Usually at this point, I placed a copy of the orginal under in multiply blend mode and masked in the flying hairs. So far so good.
The new technique I don't get why it works is this:
- Just duplicate the 1st pass selection.
- Clip the dupe.
- Set the main (underlying) layer to multiply.
- At this point everything looks multiplied with the blue BG because the clipping behaves as a group.
- So we uncheck the layer style option "Blend clipped layers as a group" so that the blendings are done the order of the layers.
I get the group thing. What I don't get is why does this clips away the white fringe since the masks are all the same ?