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Click the “I'm Feeling Lucky” button and Picasa will change your picture's colour and contrast to produce what it thinks is the ideal image. You will see a change only if your picture is not already colour balanced. Click the “Undo Enhance” button below to remove the change.

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digiKam already provide more colors auto-correction tools than picasa using Fix/Colors/Auto-correction. Take a look at this url :

http://docs.kde.org/development/en/extragear-graphics/digikam/using-kapp-imageeditor.html#using-kapp-correctingcolor

Gilles Caulier