You might have to write a script.

-----Original Message-----
From: Nikolai Vladychevski [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, April 10, 2002 1:31 PM
To: Cruz, John J
Cc: [EMAIL PROTECTED]
Subject: 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? 
> 
> jjc

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 
> 
>  
> 
> Hello,  
> 
> 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 
> background:  
> 
> http://www.isl.net.mx/paso1.gif  
> 
> This object has an antialiased border to integrate smootely with the 
> background.  
> 
> If I remove the background using selection tools in Gimp I will get a
result 
> 
> like this:  
> 
> http://www.isl.net.mx/paso2.gif  
> 
> Wich is the result of antialiasing effect, and if I remove the purple
color, 
> 
> there is no way to remove it completely, some of it will stay:  
> 
> http://www.isl.net.mx/paso3.gif  
> 
> 
> I investigated and found that antialising effect changes Alpha values of
the 
> 
> pixels, so if I place any background backward, the object will adapt to
the 
> background smoothely. Unfortunately, I already have background on my
photos 
> and the object together in the image and I need to do the reverse, I have
to 
> 
> separate the object from the background, so I need to do something with
the 
> alpha values of the border pixels, right now they are equal to 255:  
> 
> http://www.isl.net.mx/paso4.gif  
> 
> 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
has 
> 
> Alpha values over yellow color instead of plain orange color ?  
> 
> Thanks in advance.
> Nikolai 
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