On 05 jun 2008, Unruh<unruh-spam@[EMAIL PROTECTED]
>, had the following
to say to the folks in comp.graphics.apps.gimp:
> I have an image in which I would like to change all whites to
> transparency. Is this possible? I have tried selecting, inverting
> selection and then copying it to a transparent background, but I
> just get a jiggly outline and cannot seem to get the image there.
> Is there some way I can on the original change all whites to
> transparent?
Color to Alpha seems pretty decent to me. (in the Color menu)
Not perfect, but I guess it depends on what you have to work with,
and what you want to do, but it could serve as a starting point,
unless somebody else has got any better ideas.
A quick test I did went as follows: copy original image onto a new
layer. Paste something else (a smaller image, different from the
other) onto the background version (or tuck another layer in between
the other two others and paste onto that). Select the top layer, and
apply Color to Alpha. In the color picker there's an eyedropper tool,
use it to select your color from the top layer.
Like I said, perhaps not perfect, but you can get some very
interesting results. Starting with large images and then shrink them
a bit makes most of the edge artifacts "go away" (become less
visible).
HTH
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