High Quality Round Corner Image in iPhone - iphone

Question

In my app, I want to high quality Image. Image is loaded from Facebook friend list. When that image is loaded in smaller size (50 * 50), its quality is fine. But when I try to get that image in bigger size(280 *280) quality of image diminished.
For round corner m doing like :
self.mImageView.layer.cornerRadius = 10.0;
self.mImageView.layer.borderColor = [UIColor blackColor].CGColor;
self.mImageView.layer.borderWidth = 1.0;
self.mImageView.layer.masksToBounds = YES;
For getting image m using following code :
self.mImageView.image = [self imageWithImage:profileImage scaledToSize:CGSizeMake(280, 280)];
- (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
UIGraphicsBeginImageContextWithOptions(newSize, YES,0.0);
CGContextRef context = CGContextRetain(UIGraphicsGetCurrentContext());
CGContextTranslateCTM(context, 0.0, newSize.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextSetInterpolationQuality(context, kCGInterpolationLow);
CGContextSetAllowsAntialiasing (context, TRUE);
CGContextSetShouldAntialias(context, TRUE);
CGContextDrawImage(context, CGRectMake(0.0f, 0.0f, newSize.width, newSize.height),image.CGImage);
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
I have checked my code several times, but could not figure out how to make image perfect. So, guys how this quality of image will be improved?
Thanx in advance...

Answer 1

…quality of image diminished.
The 'quality' of the image is still present. (Technically, you are introducing a small amount of error by resizing it, but that's not the real problem…)
So, you want to scale a 50x50px image to 280x280px? The information/detail does not exist in the source signal. Ideally, you would download a more appropriately sized image, for the size you want to display at.
If that's not an option, you could reduce pixelation by means of proper resampling and/or interpolation. This would simply smooth out the pixels your program magnifies by 5.6 -- the image would then look like a cross between pixelated and blurred (see CGContextSetAllowsAntialiasing, CGContextSetShouldAntialias, CGContextSetInterpolationQuality and related APIs to accomplish this using quartz).