Originally Posted by lionelhuts
I have not heard of any 4K TV that does not upscale from 1080p by doing linear 2x2 scaling.
Are you sure? Most of what I've been able to find claims that 4K TVs typically upscale/interpolate 1080P content. For example, from here: http://www.tvpredictions.com/answer182021014.htm
"Finally, I asked Raymond Soneira, president of DisplayMate Technologies, for his expert opinion. Soneira said all HD images will "look somewhat better on 4K" because the upscalers will interpolate the 4K pixels rather than use "straight pixel replication...so the images will appear less pixelated.""
("Straight pixel replication" is exactly what I would prefer)
Or from here:
"To display a 1080p content, a 4k TV upscale the resolution of it. This upscaling process is a series of filters designed to interpolate the new pixels based on the fewer old ones. In its simplest form, you can think of it as simply averaging the values of the pixels. This doesn't add any new information, it simply smooth it to be able to display the picture on 4 times the amount of pixels."
And lastly, from the description of a Sony 4K TV on Amazon:
"Sony’s unrivaled 4K X-Reality PRO picture processor enhances everything from sports to TV shows to Blu-Ray Disc movies. Based on ten years’ experience upscaling movies to 4K in over 15,000 theaters worldwide, Sony has developed and perfected a processor so advanced, it can upscale HD content to 4K quality."
So it definitely sounds like 4K TVs typically have this upscaling capability, but is it ever an option than can be turned off?
Considering how poor the options are for handling 480p video on the typical 1080p TV, I'm guessing no, but I'd be happy to be wrong.