This is a tough task that sounds simple.
I would use Fuzzy Select tool on the background, playing with the threshold
until the selection looked good. Then invert the selection, and use
<image>/Select/Shrink to unselect any extra background artifacts around the
You can try the feather and antialias options with the select to blur the
edges of your selection.
You might try the edge detect filters. Then using the Image/Colors/Levels
tools to isolate the strong edges. Then use the resulting image with the
Fuzzy Select or as a mask/channel.
Either way some hand editting is involved. I doubt there is a quick and
easy technique. If there is, I'd sure be interested to know how.
From: Nikolai Vladychevski [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, April 10, 2002 12:31 PM
To: Cruz, John J
Cc: [EMAIL PROTECTED]
Subject: [Gimp-user] Re: Separating objects from the background
Cruz, John J writes:
> Have you tried installing a border around the object of a color of your
> choosing and making certain that the border is up-front?
but the problem is I have not object yet to produce its border. The oval was
just an example, I have a lot of photos of products here and all have
background that I want to remove cleanly and fast, without doing
pixel-by-pixel art ...
> -----Original Message-----
> From: Nikolai Vladychevski [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, April 10, 2002 12:15 PM
> To: [EMAIL PROTECTED]
> Subject: [Gimp-user] Separating objects from the background
> I will have to redesign a site (shopping site) with white background color
> and since the actual site uses photos of the product with the some
> backgrounds (black, gray ... all monotone colors) I will have to remove it
> and I don't know how to do this properly.
> Lets say I have an example like this, an yellow oval shape over purple
> This object has an antialiased border to integrate smootely with the
> If I remove the background using selection tools in Gimp I will get a
> like this:
> Wich is the result of antialiasing effect, and if I remove the purple
> there is no way to remove it completely, some of it will stay:
> I investigated and found that antialising effect changes Alpha values of
> pixels, so if I place any background backward, the object will adapt to
> background smoothely. Unfortunately, I already have background on my
> and the object together in the image and I need to do the reverse, I have
> separate the object from the background, so I need to do something with
> alpha values of the border pixels, right now they are equal to 255:
> How can I do with gimp to remove the purple color fully and convert the
> borders where the object is merging with the background into pixels that
> Alpha values over yellow color instead of plain orange color ?
> Thanks in advance.
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> [EMAIL PROTECTED]
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