wackojacko1138 wrote:I've got a 3DTV that can do 240 Hz, giving us 120 Hz 3D image. I suppose that would make 24 fps movies look better, too. I really hate watching standard definition on an HDTV for similar reasons. 1080 does not divide evenly into 480, making standar definition look even worse on a high definition television. But before too long everything will be airing in HD, so I can deal with it by watching 3D Blu-rays.
You don't have a "3D" TV; you have a stereoscopic
TV. Without lenses (setting the TV distance to "infinity") and a carefully chosen seating position, you may be better off just using it in 2D mode (doubly true if your only see the world in 2 1/2 dimensions to start with).
Anyway, I think I figured out how the HD resolutions were derived: back in the day, many movies were shot with the 16:9 aspect ratio. These days, many movies are shot in the more extreme 2:1 aspect ratio, but that is beside the point.
When they were coming up with the resolutions, "Standard Definition" was about 640x480 (a 4:3 aspect ratio) (exact resolution varies). What happens to the resolution when you "letter box" a 16:9 movie on a 640x480 display?
So the effective resolution of a 16:9 signal on a SD display is 640x360.
Of course, throwing a monkey wrench into all this is my 27 inch TV that can convert itself into a 24 inch widescreen TV by squeezing the picture. In widescreen mode I can get that full 640x480 SD resolution; no letter boxing required. I have not been able to train my family to take advantage of that though. If I leave the DVD player in widescreen mode, they are content to watch the picture vertically stretched.
I also hate widescreen TVs displaying a 4:3 signal horizontally stretched. I can understand why people do it though: Imagine your have some "content" with a 16:9 aspect ratio, but you (a TV broadcaster) are still broadcasting a 4:3 SD signal. You have to letter box with horizontal black bars, sacrificing 120 lines of resolution. Your viewer has a brand new HD TV with a 16:9 native resolution. To preserve the aspect ratio, vertical black bars must now be applied. The result is a black frame all the way around the picture. Your 30 inch TV is essentially converted into a 22 inch TV. That is why some models let you zoom in to actually use the whole screen when this occurs.