Auto Contrast
analyzes photos and corrects common contrast problems, such as the
lack of distinction between bright and dark areas.
Click the Fix tab to open it.
Select one or more photos in the Photo Browser. (Ctrl-click
photos to select more than one.)
On the Fix tab, click Auto
Contrast.
Auto Contrast creates copies of the selected photos,
adjusts the contrast in the copies, and saves the copies in the
version sets of the photos on which they are based.