Control
            the gradations between the light and dark areas of an image by adjusting
            the contrast.
         
         To adjust the contrast in an image:
         
         
            - Select the range you want to modify.
            
- Click the Contrast field and adjust the
               contrast value of the image. Increase the value to increase the
               contrast in the image; decrease the value to decrease the contrast
               in the image. The minimum value for contrast is 0, which produces
               a flat grey image.
            
- Click Process to apply the changes to
               the clip.