Taking High resolution screenshot for ratina display ... iOS

CGRect screenRect = CGRectMake(0.0f, 44.0f,320.0f, 424.0f);

//High Resolution ScreenShot (640*848)

 UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque,  [[UIScreen mainScreen] scale]);

     [view.layer renderInContext:UIGraphicsGetCurrentContext()];

     

     UIImage * img = UIGraphicsGetImageFromCurrentImageContext();

     

     UIGraphicsEndImageContext();


//Low Resolution ScreenShot (320*424)

UIGraphicsBeginImageContext(screenRect.size);

CGContextRef ctx = UIGraphicsGetCurrentContext();

[[UIColor blackColor] set];

CGContextFillRect(ctx, screenRect);

    [self.view.layer renderInContext:ctx];

screenImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();