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Imshow(I,[low high]) displays the grayscale image I, specifying the display range for I in [low high]. The value low (and any value less than low) displays as black; the value high (and any value greater than high) displays as white. Values in between are displayed as intermediate shades of gray, using the default number of gray levels. If you use an empty matrix () for [low high], imshow uses [min(I() max(I()]; that is, the minimum value in I is displayed as black, and the maximum value is displayed as white.
Bio-Medical Engineering-Lecture Notes