How would I alter the hue and sharpness of an image on the iPhone?

I would like to be able to adjust the 开发者_Go百科hue and sharpness of an image for display within a UIImageView in my iPhone application.

How would I process an image to alter these characteristics?

Apple's GLImageProcessing sample application has routines for adjusting the hue and sharpness of an image using OpenGL ES 1.1.

Have you tried ImageMajick - I believe there has been some success porting it to iOS:

http://www.imagemagick.org/discourse-server/viewtopic.php?f=4&t=14089