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FsaaModern graphics_cards usually support some method of FSAA or Full Scene Anti-Aliasing to help avoid aliasing and jaggies on full screen images. The resulting image may seem softer, and should also appear more realistic. One tried and true method of avoiding or removing aliasing artifacts on full screen images is over-sampling. In general, over-sampling is a technique of collecting data points at a greater resolution (usually by a power of two) than the final data resolution should be. These data points are then combined (down-sampled) to the desired resolution, often just by a simple average. The combined data points usually lack aliasing artifacts or moir patterns. Full Screen Anti-Aliasing by over-sampling usually means that each full frame is rendered at double (2x) or quadruple (4x) the display resoultion, and then down-sampled to match the display resolution. So a 4x FSAA would render four over-sampled pixels for each single pixel of each frame. More often than not, FSAA is implemented in hardware in such a way that a graphical application is unaware the images are being over-sampled and then down-sampled before being displayed.
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