Here's a short blurb from Panasonic on the PX300, "The new VIERA TH-PX300 plasmas are available in three screen sizes (50-inch diagonal screen measurement, 42-inch and 37-inch), all featuring the new PEAKS (Picture Enhancement Accelerator with Kinetic System) processor that enables rendering of 3.62 billion colors. This technology is unrivaled in the world providing 2,048 steps of gradation to deliver greater image depth. The current high-end VIERA models offer 1.07 billion colors and 1,536 steps of gradation. Panasonic's proprietary PEAKS technology has elevated the flat-panel picture quality to new standards. "