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Contrast mask tutorial · 2

Desaturate and invert the overlay layer

On the image toolbar desaturate the layer

Layer » Colours » Desaturate  (GIMP 2.2)
Colours » Desaturate  (GIMP 2.4 & 2.6)
Desaturate

Then on the same toolbar invert the layer

Layer » Colours » Invert  (GIMP 2.2)
Colours » Invert  (GIMP 2.4 & 2.6)
Invert

You should notice the image is now a lot clearer.

 
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