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Levels & Gamma tutorial · 2
Apply the auto levels tool
With the value layer selected open the levels dialogue found on the image toolbar
Layer » Colours » Levels (GIMP 2.2) Colours » Levels (GIMP 2.4 & 2.6)
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Click the Auto
option, which will activate Gimp's automatic correction of colour, contrast and brightness.
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Download GIMP 
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