You can try "Color to Alpha" using a background  color not found on the
stamp, but you may end up needing to do back-filling under the stamp (draw
on a layer underneath it) where it removed a portion, and it probably won't
work that well for real-world images (slight variations aren't handled well
by the algorithm).  You can also use a painting mode of Color to Alpha to
only clean up artifacts a select-by-color and removal leaves, but that's
more work.

The foreground extraction method is intended to do something similar to
what you're wanting, but until the new one is ready (see its only a binary selection so
you'll not get nice removal of color components and you'll see bleed.

You might take a look at the Bluebox plug-in with GAP (you'll have to
locate/install the GAP plugins for your platform); haven't used it
personally but it seems like it has the right options.

Best of luck,

Seth Burgess

On Tue, Jan 17, 2012 at 2:29 PM, Chris Mohler <> wrote:

> On Tue, Jan 17, 2012 at 2:17 PM, Jay Smith <> wrote:
> > Goal:
> >
> > To be able to select the background (for change to 100% black) without
> any
> > "leakage" of the selection onto the stamp objects AND without ANY
> non-black
> > color artifacts remaining after changing the selection to 100% black.
> Question: have you tried scanning with a dark-as-possible background*
> and then doing 'Colors-Levels' and dragging the right-hand slider over
> until the background is "solid black"?
> Also, the "halo" may be a result of the height of the objects/stamps -
> have you tried adding weight on top of the objects to get them as flat
> as possible?
> Chris
> * something black, with a non-reflective surface.
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