var point0 = new CIVector(0, 0); // Default [0 0]
var point1 = new CIVector(250, 250); // Default [200 200]
var linearGrad = new CILinearGradient() {
	Point0 = point0,
	Point1 = point1,
	Color0 = new CIColor (UIColor.Red),
	Color1 = new CIColor (UIColor.Blue)
};
		
// The Generator Filters need to be cropped before they can be displayed
var crop = new CICrop (IUCrop () {
	Image = linearGrad.OutputImage,
	// Create the Bounds based on the Size of the application Window. (UIWindow)
	Rectangle = new CIVector (0, 0, window.Bounds.Width, window.Bounds.Height) 
};		
		
// Get the final Generated image from the Crop filter
var output = crop.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);