Curtis0620 said:Won't your set do it anyway?
Perhaps, but multiple passes through lossy decompression/compression is a bad idea. Each time through you'll premanently lost more information.
Best to avoid having E* (in transmission or receiver) recompress/rescale then have the TV also rescale.
For example, for my 720p DLP, best picture for ABC/ESPN/FOX is to set the 921 to 720p - this sends the 720p source directly to the display.
For 1080i I can either set the 921 to 1080i and let the TV scale, or use 720p and let the 921 scale (I prefer the scaler in the TV).