How to draw an CGImage with some alpha transparency?

Question

Want to draw an UIImageView which has an CGImage, and the UIImageView has alpha 0.5f. But this CGContextDrawImage function doesnt take an transparency value. So how could I draw an image slightly transparent?

To be clear: The image itself is not transparent, but I want it to be "dimmed" a little bit. Just like you would do with an UIImageView and some alpha like 0.5f :-)

Answer 1

I haven't tried this but try calling CGContextSetAlpha() before CGContextDrawImage().