Why do 4K videos on 1080p monitor look better than 1080p videos on 1080p monitor? The monitor displays the same amount of pixels in both cases, doesn’t it?

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Why do 4K videos on 1080p monitor look better than 1080p videos on 1080p monitor? The monitor displays the same amount of pixels in both cases, doesn’t it?

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As we need a lot of images to make a video, we try to find clever ways to reduce the amount of data needed for each image. One of those ways consists of storing color info for a subset of pixels. For example, if those 4 pixels are each some kind of reddish tint, let’s say it’s red for the 4 pixels, it will be easier to store.
We do the same thing for 1080p and 4k video. But if we display a 4k video on a 1080p monitor, suddenly those 4 pixels are displayed with the size of only 1. So it’s not grouping pixels anymore. In a way, 4k on a 1080p monitor would be like an excellent encoding of 1080p video where we would store the color value independently for each pixel (we do that on a pro level, but that’s not usually what we see on tv)

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