How to chage the brightness of image?

hai i am new to iphone programing ,in my app i want to chage the image brightness ,contrast ,sharpness,saturation ,i saw the apple example for this but i wont get any thing so ,any can guide me

If it's a BufferedImage, then you have direct access to the pixels through no less than 4 methods. The easiest one being
myBufferedImage.getRGB(int x, int y);If it is not a BufferedImage, then you will need to use the PixelGrabber class. The documentation of the class is pretty self evident. You specify an image, the rectangular region to grab pixels, and call one of the grabPixels() methods.
If it all possible, I would recommend you stay away from the PixelGrabber class and stick with BufferedImages+. PixelGrabber is an antiquated class.
EDIT
I think this is the second time I've done this. Should of payed attention to the thread date. Normally the threads on the front page are recent. At least this one has alot of views.

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