Problems making an UIImageView opaque on the iPhone

Question

Doing as little alpha blending as possible is an important performance consideration for table view cells on the iPhone. I have table cells that are largely comprised of one big image view. I have set the UIImageView to be opaque, in both Interface Builder and programmatically, but the CoreAnimation instrument still shows that it is being alpha-blended.

Is there a way to make UIImageViews actually opaque, or am I going to have to do custom drawing to keep from blending?

Answer 1

It's likely that your image contains alpha channel. Although the image is opaque, iOS still treats it as semi-transparent. Try to remove this alpha channel using Photoshop by going to: Layer > Background From Layer