I have a pretty large DVD and Blu-Ray collection, and I play all of them with a Blu-Ray player. When I play my DVDs on there, they look nice and sharp, definitely not Blu-Ray quality but still very nice, while when I play an uncompressed DVD rip on VLC Media Player it looks, well, like a DVD. I know my Blu-Ray player isn’t actually adding any detail, and it doesn’t have that weird artificial sharpness, so what is it doing?
In: Technology
You have a pixel. You turn that into four pixels in a square shape. You’ve just upscaled the pixel. That’s the simplest upscaling, but it tends to look blocky. So they use algorithms to smooth out the differences. You had a white pixel next to a black pixel, so maybe they don’t do four white and four black, but throw some grey pixels in there to make it look smoother. That will look better in a soft natural life scene, but it will also make hard boundaries (like when overlaying text) look a little fuzzy.
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