How to scale up an UIImage without smoothening anything?

Question

I want to scale up an UIImage in such a way, that the user can see the pixels in the UIImage very sharp. When I put that to an UIImageView and scale the transform matrix up, the UIImage appears antialiased and smoothed.

Is there a way to render in a bigger bitmap context by simply repeating every row and every column to get bigger pixels? How could I do that?

Answer 1

#import <QuartzCore/CALayer.h>

view.layer.magnificationFilter = kCAFilterNearest

Answer 2

When drawing directly into bitmap context, we can use:

CGContextSetInterpolationQuality(myBitmapContext, kCGInterpolationNone);

I found this on CGContextDrawImage very slow on iPhone 4