I have a Sony High Scan 53. I have noticed that while watching either DVD's or satellite TV I get a dithering or gradating effect in my backgrounds. The effect occurs when going from light to dark areas in the picture. I can physically see divisions of color gradations in the areas of the picture when going from the light to dark areas. Does anyone have any experience with this effect and how to resolve the issue? Is it my TV or an adjustment that I can make?