28 days later is a weird movie because it was filmed in digital Standard Definition (480p resolution). I can't think of another movie which was filmed this way. Watching it on BluRay is sort of pointless for that reason. BluRay is 1080p, so the movie would just be stretched because it was only shot in 480p, If you watched 28 Days Later on BluRay, it would look nearly the same as if you watched it on DVD.
Even the screenshot from the tweet looks blurry. That's actually how the movie looks because it was filmed on a digital camera from 1997.
If it's shot on film and you go back to the original film stock or negative and make a higher definition version from that, fine by me, it's an analogue format you're digitizing and you're getting the best fidelity possible. If something was shot on digital in the first place, don't do anything, it was shot that way and is therefore meant to look that way.
Wikipedia says the director wanted to use a camera that was more maneuverable because the movie is filmed with a lot of movement. Also it says that they filmed in downtown London without a permit, that they just like asked people to not go on the streets that they were filming. Having a portable camera helped with this. The camera that was used was the Canon XL1.
In addition to what dead said, there's an artistic element. The last scene switches to film after the characters have largely escaped the horror and made contact with organized groups (I remember a fighter jet or something?).
28 days later is a weird movie because it was filmed in digital Standard Definition (480p resolution). I can't think of another movie which was filmed this way. Watching it on BluRay is sort of pointless for that reason. BluRay is 1080p, so the movie would just be stretched because it was only shot in 480p, If you watched 28 Days Later on BluRay, it would look nearly the same as if you watched it on DVD.
Even the screenshot from the tweet looks blurry. That's actually how the movie looks because it was filmed on a digital camera from 1997.
If it's shot on film and you go back to the original film stock or negative and make a higher definition version from that, fine by me, it's an analogue format you're digitizing and you're getting the best fidelity possible. If something was shot on digital in the first place, don't do anything, it was shot that way and is therefore meant to look that way.
why did they do that?
Wikipedia says the director wanted to use a camera that was more maneuverable because the movie is filmed with a lot of movement. Also it says that they filmed in downtown London without a permit, that they just like asked people to not go on the streets that they were filming. Having a portable camera helped with this. The camera that was used was the Canon XL1.
In addition to what dead said, there's an artistic element. The last scene switches to film after the characters have largely escaped the horror and made contact with organized groups (I remember a fighter jet or something?).
it's not stretched in the sense that it is the correct aspect ratio, it's just upscaled
Well, with AI we can now stretch the density of images.