// Create a CIStarShineGenerator filter with the input image
var star_shine_generator = new CIStarShineGenerator () {
	Radius = 20,
};

// Get the altered image from the filter
var output = new CICrop {
	Image = star_shine_generator.OutputImage,
	Rectangle = new CIVector (0, 0, 400, 300)
}.OutputImage;

// Give the image a black background
output = new CISourceAtopCompositing {
	BackgroundImage = new CICrop {
		Image = new CIConstantColorGenerator {
			Color = new CIColor (UIColor.FromRGB (1, 1, 1)),
		}.OutputImage,
		Rectangle = new CIVector (0, 0, 400, 300),
	}.OutputImage,
	Image = output
}.OutputImage;

// To render the results, we need to create a context, and then
// use one of the context rendering APIs, in this case, we render the
// result into a CoreGraphics image, which is merely a useful representation
//
var context = CIContext.FromOptions (null);

var cgimage = context.CreateCGImage (output, output.Extent);

// The above cgimage can be added to a screen view, for example, this
// would add it to a UIImageView on the screen:
myImageView.Image = UIImage.FromImage (cgimage);