Re: [Gimp-user] Seeking better "green screen" method

On Tue, Jan 17, 2012 at 2:52 PM, Jay Smith <jay jaysmith com> wrote:
No to "Colors-Levels....".  The problem in that operation is that it would
also affect the related black areas in the postmarks on the stamp.  The
color of the postmarks should not be darkened as it would change the
appearance of the image (which are actual items that people are expecting to
appear in the image as they are in real life).

OK - just thought I'd throw a "quick and dirty" approach out there ;)

I agree that height/thickness is part of the problem.  Yes, we have added
weight with no affect on most items.

Please note that the "weather person standing in front of a weather map" has
not only their own thickness, but a foot or two between them and the map.
 If the room lighting is not 100% right, one can see a bit of "green screen
shadow", but 99% of the time there is no shadow and no halo.  I am hoping
that level of success can be achieved in what I am trying to do.

Ah, but camera != flatbed scanner.

If I was going to do an index replacement (aka "green screen"), I'd
use a solid background of intense color that won't be present in the
item.  Then I might:

Select the background (with fuzzy select), fill with black.  With the
selection still active, feather it (to the approx width of the "halo"
and then Colors->Desaturate.

But it's hard to come up with a workflow without seeing an example.
Can you post an example scan with a colored background and "halo"?


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