If the curve is changed into a concave shape below the original diagonal, the enhanced image will be darker than the original.
Normal
Image
Darkened
Image
Operation:
1Click on the Tonal Map icon in the Preview window or the Tonal Map tab in the Enhancement dialog box. Tonal Map dialog box will appear.
2Click on the Tonal Map curve, an indicator appears which can then be dragged to change the shape of the curve.
a)If a previously saved Tonal Map is desired, select the Load button. An Open dialog box appears for you to open the desired file.
