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.