Originally Posted by Pineapple
If the Sammy is displaying a 1920x1080 image (over VGA) and it has ~1" borders on all sides, doesnt that mean the image being displayed on the Sammy is less than 1920x1080. Meaning that somehow the Sammy is scaling the image down slightly. Why would the Sammy scale down a 1920x1080 image from VGA?
Yes, it is scaled down.
If I increase the picture size with p.size, isnt that just artificially blowing up a slightly scaled down 1920x1080 picture?? All this distortion/conversion has got to be bad for the PQ on VGA. I think thats what Im seeing when I play games on my Xbox 360 over VGA @ 1920x1080.
No. On the VGA input, I believe the scaling is done in the analog domain, before conversion to digital, so when you change the picture size, you change the degree of scaling. When you increase the picture size, you reduce the scaling and at the max picture size, you should be able to get 1:1 mapping. However, there is some overscan at this point. Which also answers your other question -- the reason it is downscaled by default is to remove the overscan because most PC users don't expect to have overscan on their computer displays.
You're probably going to ask why Samsung built these TVs to have overscan at 1:1 mapping. I don't know if anyone knows for sure but I think it's primarily for the same reason old CRT-based TVs had overscan -- to hide some imperfections. For example, without overscan, pincushioning and alignment problems would be more noticeable even to regular viewers.
Note that on the other inputs, eg. HDMI, the default setting for these Samsungs is to also scale, but in the other direction -- increasing the overscan some more. There's plenty of discussion in this thread about it. Unlike the VGA input, this scaling is digital and can only be on or off.