Raul; (sorry for delayed answer ... had an address issue)
Equalization evenly spreads the image luminescence over the luminescence range. (Not the same as just evenly placing the pixels in the range). The effect is to allow details ,usually in the darker areas, to emerge from the image. Local equalization works its magic within a frame/box which is then moved over the entire image. The effect is to further enhance detail in all segments of the image. When the 'frame' is small the effect is extreme but as the frame is enlarged the effect can be very useful in photography without becoming 'too obvious'. To give an idea of the application I have attached a small pair of test files (heavily compressed). Notice that not only is detail pulled out of the dark areas but that also the high luminance areas are able to pick up added detail. The frame in this test is still small (100 x 100) 10% of the image so the effect is rather extreme. David
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