Quivis <quivis@[EMAIL PROTECTED]
> writes:
>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).
Yes, thanks. That works. Well the original image was black and white, for
which "colour to alpha" is greyed out, so I had to convert it to an RGB
first.
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