Please find the below method. It is the most easiest way. You can set the maximum and minimum values and adjust the image to that region.
low = 0.3; high = 0.7; K = imadjust(I,[low high],[]); % I is double
Another way of contrast enhancing is by doing histogram stretching. you can use histeq (see doc histeq for more details), or you can stretch it manually.
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