digiKam from trunk : Image Editor : new advanced features for photograph : Over and Under exposed pixel indicators.

These tools render the over-exposed (pure white) and the under-exposed (pure black) over the picture.
The colorize colors can be customized in Setup Image Editor.
You can use F10 and F11 keys to toogle on/off these options.
On the right corner of the status bar, there are 2 flags to show if these options are enable or disable.

By default:
- under-exposed pixels are colored in black
- over-exposed pixels are colored in white
- both options are disable

2 screenshots are available at these urls:
<a href="/issues/2007-01-21/files/underexposureindicator.png">http://digikam3rdparty.free.fr/Screenshots/underexposureindicator.png</a>;
<a href="/issues/2007-01-21/files/overexposureindicator.png">http://digikam3rdparty.free.fr/Screenshots/overexposureindicator.png</a>;