Thread Subject: How to Change the specified pixel value of an image?

Here are 2 images. Original and Processed.

Original:
http://bp2.blogger.com/_dY9PPdeLapU/SCAXQJWgxYI/AAAAAAAAAKI/
oA9Pewda5rA/s320/original.bmp

Processed:
http://bp0.blogger.com/_dY9PPdeLapU/SCAYApWgxZI/AAAAAAAAAKQ/
yrSxCKYLlIs/s320/processed.bmp

I want to check the white pixels on the Processed Image
against the original. If they are white on the original,
make it black. If not keep them white.

The code I tried is like this:

>> [row, col] = find(Processed == 1); %Obtain the
coordinates of the white pixels
>> if Original(r,c) == 1 %If on the original the they are
white
Processed(r,c) = 0; %Make it black
end

Somehow the program doesn't work. It fails to remove any
pixel on the Processed Image.

Can anyone tell me what is wrong with the code?

The image links are incompletely highlighted.

Please visit:

http://dawnllc.blogspot.com/2008/05/matlab-how-to-change-
specified-pixel.html

to view the images regarding to the question.

Thanks very much.

"Dawn ":
<SNIP a matter of logic...

one of the many solutions

% the images
     a=zeros(4); % the original...
     a(2,:)=1;
     b=a;
     b(2,[1,end])=0;
     b(3,:)=1; % the processed...
% the engine
     c=b;
     c(a&b)=0;
% the result
     a,b,c

us

"us " <us@neurol.unizh.ch> wrote in message <fvp6h0
$2rp$1@fred.mathworks.com>...

> % the engine
> c=b;
> c(a&b)=0;

This works. Thank you.