For my final GSOC 2011 task, I set out to build a levels module for darktable, which would behave more or less like the levels tool in GIMP and similar image editors. The user sets a white point, black point, and middle grey point for their image on a histogram, and the tool adjusts the image to match the chosen boundaries. In my git branch, I now have the levels module functional.
Introducing The Levels Module
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bieber