[ Thanks to Dmitri
Popov for this link. ]
“If a photo has problems with exposure, the Color |
Auto-correction menu item should be your first stop. The Auto
correction feature offers several presets that can instantly
improve the default exposure. The Auto Exposure preset usually
provides the best result, but there is no reason why you shouldn’t
experiment with other available options, such as Auto Levels,
Normalize, Equalize, and Stretch Contrast.“As any photo editor worth its salt, digiKam offers level
adjustment (Color | Levels Adjust) and curve adjustment (Color |
Curves Adjust) tools which you can use to adjust exposure. Using
both tools is not particularly difficult. With the level adjustment
tool, you can tweak the exposure settings using the slides under
the histogram, while the curve adjustment tool lets you adjust
exposure by dragging the curve on the histogram.”