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How can i modify matrix which i retrieve from image?

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Umme Tania
Umme Tania 2013-6-19
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)
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Iain
Iain 2013-6-19
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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