mirrored image orientation + iphone

if (mirrorOn==NO) {
       rgbImg.image = [UIImage imageWithCGImage:rgbImg.image.CGImage scale:rgbImg.image.scale orientation:UIImageOrientationUpMirrored];
       mirrorOn=YES;

    }
   else if (mirrorOn==YES) {
       mirrorOn=NO;
       rgbImg.image = [UIImage imageWithCGImage:rgbImg.image.CGImage scale:rgbImg.image.scale orientation:UIImageOrientationUp];

    }