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Benedict_Arnold said:Most 4K TVs upscale.
If you feed it a 16:9, that is 1920 x 1080 (1080i/p) picture it'll upscale it to 3840 x 2160. How it does that preceisely I don't know. I presume it somehow averages the spaced-out original dots to fill in the extra ones in between.
If you feed it a 4:3 picture or a 21:9 or 2.35:1 picture, it'll show black bars either to the left and right or bottom and top. Whether thats the DVD / BluRay sending "show these bits as black" or the TV deciding for itself I don't know.
As for Cherly looking bad at 4K, well, what do you expect? A higher resolution picture only enhances what's already there. Look how ofter old boilers like Joan Collins appear on TV and movies in "soft focus". Personally I'd rather watch Crufts.