// Create CIImages from files.
CIImage clouds = CIImage.FromCGImage (UIImage.FromFile ("clouds.jpg").CGImage);
CIImage heron = CIImage.FromCGImage (UIImage.FromFile ("heron.jpg").CGImage);
        
// Construct the SourceOverComposite filter
var sourceOverComposite = new CISourceOverCompositing() {
	Image = heron,
	BackgroundImage = clouds
};
		
// Get the composite image from the filter.
var output = sourceOverComposite.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);