How to Rotate a UIImage 90 degrees?

Question

I have a UIImage that is UIImageOrientationUp (portrait) that I would like to rotate counter-clockwise by 90 degrees (to landscape). I don\'t want

Answer 1

"tint uiimage grayscale" appears to be the appropriate Google-Fu for this one

straight away I get:

https://discussions.apple.com/message/8104516?messageID=8104516�

https://discussions.apple.com/thread/2751445?start=0&tstart=0

How would I tint an image programmatically on the iPhone?