PhotoComix wrote:
yes multiply will darken, while lowering opacity may weaken colors and contrast , this may be corrected with curve but ,in practice the color and contrast and luminosity shift may be esthetically pleasurable, and a correction not worth
it is not strictly needed add the alpha layer for merging, somehow gimp do its magic and merge well the layer also if there is not an alpha channel
BTW for merge I do NOT intend merge down
once the top layer mode is changed and opacity dosed just do
Layer/New from visible
OR Edit/copy VISIBLE + Edit/paste as/new image
that allow to save the result but also to go back to experiment with other modes o
Those are good points.
_________________

The last time I kept an open mind,
my brain fell out and the dog grabbed it.
Now it's full of dirt, toothmarks, and dog slobber.
No more open minds or dogs for me.