I've been working on a Silverlight application to compare two images. One from an HD source (such as blu-ray) and one from a standard definition source (DVD).  The goal is to see how much of an improvement one can expect if they were to repurchase a movie on blu-ray.

Right now, the tool offers a few comparison modes:

1) Dual View - This allows you to see two images as if they were 1.  When you move the mouse left or right, you can see more of one image and less of the other.

2) Swap View - This allows you to see one image in its entirety, and then, when mousing over, you can see the other image.

3) Rectangle View - This mode shows one image on the screen and allows you to draw, with your mouse, a rectangle.  The rectangle will show you part of the other image so that you can compare a specific portion of one image to the other.

The other thing you can do is enter the URL to two images and load them within this application.  As of right now, the images should be 1920x1080.  Images can be found on several AV forum websites.

I plan to add more features, and also to include links to existing more images for comparison.

Check it out.  You will need Silverlight 2 Beta 2 runtime in order to view this.

BD/DVD Image Comparison