MATLAB: How can i modify matrix which i retrieve from image

image processing

I have a gray image, i want to see only the black part ,rest of image i want to replace with value 250, so that gray part will be white.
    f=imread('image1.jpg');
    T = zeros(size(f));  
    for ii = 1:numel(f)
        if f(ii)<50
           T(ii) = f(ii);
        else
           T(ii) = 250;
        end
    end
    imshow(T)

Best Answer

Try:
 %if the problem is just the data type, this should work:
 T = f;
 T(T>50) = 255;
If the problem is that you can't see the very few black pixels, tell us the result from
 sum(f(:) <51)
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