MATLAB: Replacement of for loop in matlab

for loop

 for i=1:size(img,1)
  for j=1:size(img,2)
  if img(i,j)<=25
   img(i,j)=255;
  end
 end
end
can anyone please tell me about the replacement of this piece of code in just one line..? I know it can be replaced with one line, but i am not able to it correctly....

Best Answer

img(img <= 25) = 255
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