[video source vs monitor resolution] Can somebody explain why a 1080p/full HD video can look great on my 42 inch 4K TV screen (no upscaling!)? (piefed.blahaj.zone)

submitted 1 week ago* (last edited 1 week ago) by akunohana@piefed.blahaj.zone to c/techsupport@lemmy.world

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Isn't a full HD resolution ( 1920 x 1080 ) almost four times less pixels than 4K ( 3840 x 2160 )? I think I understand that a higher bit depth gives me more information per pixel, resulting in for instance less banding, but I still expected my 1080p 10-bit video files to look very soft and literally low-res.

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[-] bizarroland@lemmy.world 1 points 1 week ago

There is still some upscaling going on in the TV.

It would have to upscale, otherwise it would have to leave some pixels blank.

[-] akunohana@piefed.blahaj.zone 2 points 1 week ago

You mean, it stretches out the image to fit the 42 inch screen?

[-] bizarroland@lemmy.world 3 points 1 week ago

The other person told you the same thing, but basically for every one pixel, it will generate four pixels that are exactly the same as that one pixel would be.

It turns a one by one array into a two by two array.

There's probably also some tech wizardry going on on the processor in the TV itself that is built in by the manufacturer.

this post was submitted on 17 Aug 2026

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