Fix Your Photo’s Exposure Problems in Seconds With This Simple Trick

You can perform this trick with just about any image editor you like (so long as it supports layers, is able to invert the image, and offers the Overlay blending mode). To see how this works, watch the video above. Alternatively, just follow these steps:
http://lifehacker.com/5889078/fix-your-photos-exposure-problems-in-seconds-with-this-simple-trick