Curves

Light Adjustment tool
It is the most advance tool of photoshop for tone adjusting.
Go to IMAGE -- ADJUSTMENT -- CURVES
By default curve is a straight line To increase the light of image we should pull middle of the line towards upper side.....
In the same way to decrease move the line towards down side.
With the help of curves we can adjust RGB channels and contrast also.
It works in different ways on different images.

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