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Color to Alpha

Oct 26, 2012, 07:39
Post: #1
Color to Alpha
I have been doing light box photography, but I want to get that pure white background as product images usually have.

My background is a light grey.. Using the wand tool, I was able to get close - but far from close enough.

http://i.imgur.com/vC5uh.jpg

... What's the right method, to turn every thing around the dime, white?

Here it is before the wand,

http://i.imgur.com/FhPyE.jpg

Thanks.
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Oct 26, 2012, 10:46
Post: #2
RE: Color to Alpha
(Oct 26, 2012 07:39)icor1031 Wrote:  I have been doing light box photography, but I want to get that pure white background as product images usually have.

My background is a light grey.. Using the wand tool, I was able to get close - but far from close enough.

http://i.imgur.com/vC5uh.jpg

... What's the right method, to turn every thing around the dime, white?

Here it is before the wand,

http://i.imgur.com/FhPyE.jpg

Thanks.
In lightbox photo, the background is blow out by having a light on it, behind the subject. So it is pure white out of the box. Or it is chosen to be a a very different color from the subject (or pure black), for light subjects like this one. This grey-on-grey photo is very hard to work with, because where the subject and background meet, you can't tell (and can't expect Gimp to tell) which gray pixels belong to what side. Your best bet is an a plain ellipse(*) select, with some fuzziness added.

(*) Actually several, one for the top of the coin, and the same one, shifted down in two three/steps, until it covers the bottom of the coin. Then add all these together to have a complete selection on the coin.

Now answering your questions on
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