photoshop
Contrast masking is a technique used to correct photos that because of the high dynamic range some of it’s areas appear underexposed while the rest of the image appears overexposed. With this technique we are able to reveal details both from the underexposed areas and the overexposed areas. This technique isn’t something new, traditional photographers used to apply the equivalent of this technique in the dark room for quite sometime now while the digital version of this technique is also used by a lot of photographers for years.
Contrast Mask Photoshop Tutorial & Photoshop Tutorials Blog