At 7:33 AM -0400 6/21/05, Tom Barry wrote: >At a viewing distance below about 2 screen widths some people >might want to consider 1080p as it becomes affordable. This has already happened. There is only one caveat: This viewing distance is not practical for lean back entertainment viewing except at the extremes (iMax etc). In viewing preference tests, average consumers did not choose to sit 3.3 picture heights from an entertainment display until the screen size was 117" inch diagonal. If you doubt this, look at how many people sit in the first few rows of a theater (unless the screening is sold out). At viewing distances below 2 picture heights we are talking about a "lean forward" viewing experience such as that which is common for computing applications. And as one would expect, this is the market where people are buying and using displays with roughly 1080P resolution. Unless you have room for a 100" diagonal screen in your home, and the requisite 13-14 foot viewing distance (~3.3 picture heights), you really do not need 1080P display resolution. >And at a >viewing distance above 3 screen widths 480p might be enough for many. > >But 720p is probably just perfect in between. ;-) When you add the capability to resample 720P up to 1080P for the small percentage of homes that will have very large home theater installations, it become crystal clear that encoding 1080 for emission - either i or P- is a waste of transmission bandwidth. Several companies have introduced sophisticated image processing chips to do this - they include de-interlacing capabilities, and in some cases motion compensated frame rate conversions that improve the presentation of 24P material. Regards Craig Regards Craig ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.