//Resize image

- (UIImage *)resizeImage:(UIImage *)image

             withQuality:(CGInterpolationQuality)quality

                    rate:(CGFloat)rate

{

	UIImage *resized = nil;

	CGFloat width = image.size.width * rate;

	CGFloat height = image.size.height * rate;

	UIGraphicsBeginImageContext(CGSizeMake(width, height));

	CGContextRef context = UIGraphicsGetCurrentContext();

	CGContextSetInterpolationQuality(context, quality);

	[image drawInRect:CGRectMake(0, 0, width, height)];

	resized = UIGraphicsGetImageFromCurrentImageContext();

	UIGraphicsEndImageContext();

	return resized;

}

UIImageView *theImageView = [[UIImageView alloc]init];

    theImageView.frame = CGRectMake(0, 64, 320, 400);

    UIImage *aImage = [UIImage imageNamed:@"shenlin.png"];

    UIImage *resizeImage = [self resizeImage:aImage withQuality:kCGInterpolationNone rate:0.2];

    theImageView.image = resizeImage;

    theImageView.frame = CGRectMake(0, 64, resizeImage.size.width, resizeImage.size.height);

    NSLog(@"%@",NSStringFromCGSize(resizeImage.size));

    [self.view addSubview:theImageView];