Lunar surface (low contrast).

(moo2): The original image.
(moo2hst2): Intensity histogram of moo2.
(moo2str1): Result of contrast stretching moo2.
(moo2heq1): Result of histogram equalizing moo2.
(moo2hst1): Intensity histogram of moo2heq1.
(moo2lab1): The labeled 8-bit color image resulting from applying connected components labeling to a binary version of moo2str1.
(moo2lab2): The grayscale equivalent of moo2str1.