Image Processing to transform background

What is a good image algorithm that will convert a background of one color
to another? One that will handle edge effects on the border between the 
background and the rest of the image?
-- 
%  Randy Yates                  % "With time with what you've learned, 
%% Fuquay-Varina, NC            %  they'll kiss the ground you walk 
%%% 919-577-9882                %  upon."
%%%% <yates@ieee.org>           % '21st Century Man', *Time*, ELO
http://home.earthlink.net/~yatescr

"Randy Yates" <yates@ieee.org> wrote in message
news:pt54no7j.fsf@ieee.org...
> What is a good image algorithm that will convert a background of one color
> to another? One that will handle edge effects on the border between the
> background and the rest of the image?

Randy,

I think the first problem is defining what is "background".  You can do it
in Photoshop very easily because it's defined.  Otherwise for a general 2-D
image without layers it's a lot tougher.

Fred

Randy Yates <yates@ieee.org> wrote in message news:<pt54no7j.fsf@ieee.org>...
> What is a good image algorithm that will convert a background of one color
> to another? One that will handle edge effects on the border between the 
> background and the rest of the image?

Randy,

The keywords I'd use are "flood fill" and "graphics gems".

There was a series of books called "Graphics Gems" that have some
wonderful algorithms for, er, graphics.

Google throws up:

http://www.codeproject.com/gdi/QuickFill.asp

as the first hit, it looks like a decent tutorial.  I'm not sure it's
precisely what you're after, but it might give you a start.

Ciao,

Peter K.

"Peter Kootsookos" <p.kootsookos@iolfree.ie> wrote in message 
news:3fca8095.0409031610.762468bf@posting.google.com...
> The keywords I'd use are "flood fill" and "graphics gems".

I think Randy's after "blue screen" and "chroma key".

I regret that I have else little to offer on the subject.

--

Matt 

"Matt Timmermans" <mt0000@sympatico.nospam-remove.ca> wrote in message news:<n78_c.27554$CG3.1981901@news20.bellglobal.com>...
> "Peter Kootsookos" <p.kootsookos@iolfree.ie> wrote in message 
> news:3fca8095.0409031610.762468bf@posting.google.com...
> > The keywords I'd use are "flood fill" and "graphics gems".
> 
> I think Randy's after "blue screen" and "chroma key".
> 

Perhaps; either way, I reckon the algorithm I pointed to would do the job.

Randy?  Can you give some more detail about what you're after.

Ciao,

Peter K.