Visual Layer - ElementCompositionPreview

MainPage.xaml.cs

using System;
using Windows.UI.Composition;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Hosting;

namespace XamlComposition
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
            this.Loaded += MainPage_Loaded;
        }

        private void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            Visual visual = ElementCompositionPreview.GetElementVisual(image);
            Compositor compositor = visual.Compositor;

            ScalarKeyFrameAnimation animation = compositor.CreateScalarKeyFrameAnimation();

            animation.InsertKeyFrame(0.0f, 0.0f); // Optional
            animation.InsertKeyFrame(1.0f, 1.0f, compositor.CreateLinearEasingFunction());

            animation.Duration = TimeSpan.FromSeconds(3);
            animation.IterationBehavior = AnimationIterationBehavior.Forever;

            visual.StartAnimation("Opacity", animation);
        }
    }
}