MonoTouch: Doubling Appearance Image size when Hue adjusted on Retina display

Question

I am setting the NavBar's background with this code which works great in Retina and non-Retina displays. There is a @2x and normal image. So, all good:

UINavigationBar.Appearance.SetBackgroundImage(
     GetImage(ImageTheme.menubar), UIBarMetrics.Default);

Now, when I apply this ChangeHue() transformation to the image to adjust its hue, on Retina displays the image is twice the size. Non-Retina displays are fine:

    UINavigationBar.Appearance.SetBackgroundImage(
       ChangeHue(GetImage(ImageTheme.menubar)), UIBarMetrics.Default);
    ...

    UIImage ChangeHue(UIImage originalImage){
        var hueAdjust = new CIHueAdjust() {
            Image = CIImage.FromCGImage(originalImage.CGImage),
            Angle = hue * (float)Math.PI / 180f // angles to radians
        };

        var output = hueAdjust.OutputImage;
        var context = CIContext.FromOptions(null);
        var cgimage = context.CreateCGImage(output, output.Extent);
        var i = UIImage.FromImage(cgimage);
        return i;
}

Here is the result in Non-Retina and Retina displays after the Hue is applied:

Answer 1

Filed a bug with the MonoTouch team. Will post solution shortly.