Iphone Image Processing Image APIS

I wanted to know about image processing APIs in Iphone like increasing or decreasing brightness o开发者_JS百科f an image , rotating image ,scaling image etc. How can I achieve this in Iphone?

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There's a lot of relevant sample code in the GLImageProcessing example You can download the source code from the following url

http://developer.apple.com/iPhone/library/samplecode/GLImageProcessing/listing12.html