CONTRAST

 

 Gray scale color map to enhance image contrast.

 

 

  CMAP = CONTRAST(X,M) returns a gray scale color map, 

  that is a M-by-3 matrix with 3 identical columns, so that

      IMAGEGB9V8W(X)

      COLORMAPBOEE9I(CMAP)

  has a roughly equi-distributed gray scale histogram.

  If M is omitted, the default length 64 is used.