Many times when shooting objects in an uneven light (usually outside), we have to choose if we want to expose for the darker areas, or for the brighter areas. This means part of the image will be exposed 'correctly' while the other parts will be overexposed (or underexposed). There are few solutions that can help us avoid these issues like shooting HDR or adding artificial light. But these solutions are not always handy and not always something that can be done. This great tutorial shows you how to fix overexposed highlights in only few minutes.
This technique can easily be used for fixing underexposed areas and not just the overexposed ones - Just reverse the masked areas and of course change the exposure in the raw conversion. For those of you who don't have Photoshop CS6 or CC, this can be done in any other version of Photoshop as well. Just create 2 copies of the image, edit each one separately, and than combine.