Converting an NSImage to grayscale

http://archives.devshed.com/forums/bsd-93/problem-with-converting-an-nsimage-to-grayscale-1326186.html

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Adjust the brightness and contrast in a picture

Brightness:
http://www.learningprocessing.com/examples/chapter-15/example-15-9/

Contrast:
http://www.codeproject.com/KB/GDI-plus/magicimage.aspx?display=Print

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Decoding a UTF-8 NSString