Photoshop Elements - Levels Adjustment
When you need to adjust the contrast in your photo the best tool for the job is 'levels'. In all flavors of Photoshop you can open the 'levels' window by using the keyboard shortcut ctrl+L in windows or cmd L on a Mac. Alternatively you can find it under enhance->adjust lighting in Elements or image->adjustments in Photoshop.
Although there is a separate 'brightness' & 'contrast' window, the 'levels' adjustment is a better option as you can really see what you are doing.
Here's a short video showing how it's done:-
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