Improve Photos with digiKam's Local Contrast Tool
digiKam offers several features that can improve photos containing under- or overexposed areas. For example, the Exposure Blending tool lets you merge multiple shots with different exposures into one perfectly exposed photo. But what if you have just a single image? In this case, you might want to give the Local Contrast feature a try. It's based on the LDR Tonemapping utility which is designed to improve the dynamic range of the photo by reducing its global contrast and increasing the local contrast. It does so by generating a desaturated and blurred version of the photo. It then combines the RGB channels of the original photo with the desaturated blurred image using either the Linear or Power function. Sounds complicated? Don't worry, the Local Contrast tool is rather straightforward to use, so you don't have to understand all its intricacies in order to achieve pleasing results.
Go there...http://scribblesandsnaps.wordpress.com/2010/06/18/improve-photos-with-digikams-local-contrast-tool/
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