CGAffineTransformMakeRotation makes image border distorted in iphone

Question

Hi, I am using CGAffineTransformMakeRotation to roatate my image that is palced in UIImageView. But I have noticed that when i move the image it makes the image border look blur and distorted. Below is my code for the same

UIImageView1.image = [UIImage imageNamed:@"sample.png"];  
albmImageView1.transform = CGAffineTransformMakeRotation(30);  

Please let me know what i am doing wrong or some other method to rotate the image.

waiting for reply