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
The foreground extraction method is intended to do something similar to
what you're wanting, but until the new one is ready (see
http://www.youtube.com/watch?v=kkQ1r5g49d4) 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,
On Tue, Jan 17, 2012 at 2:29 PM, Chris Mohler <cr33...@gmail.com> wrote:
> On Tue, Jan 17, 2012 at 2:17 PM, Jay Smith <j...@jaysmith.com> wrote:
> > Goal:
> > To be able to select the background (for change to 100% black) without
> > "leakage" of the selection onto the stamp objects AND without ANY
> > 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?
> * something black, with a non-reflective surface.
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