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Comment by pimlottc

3 years ago

I can’t really see any difference in those images on the Twitter example when viewing it on mobile

The animation when you change images makes it harder to see the difference, I opened the three images each in its own tab and the differences are more apparent when you change between each other instantly.

  • But that’s not realistic?

    If you have to have both and instantly toggle between them to notice the difference, then it sounds like it’s doing its job well and is hard to notice the difference.

At full size it's super obvious - I made a side-by-side:

https://i.imgur.com/I6EQ05g.png

Something similar to jpeg artifacts on any surface with a normally smooth color gradient, in some cases rather significant.

I didn't see it immediately either, but there's a ton of added noise. The most noticeable bit for me was near the standing person's bent elbow, but there's a lot more that becomes obvious when flipping back and forth between browser tabs instead of swiping on Twitter.

look at the green drapes to the right, or any large uniform colored space. It looks similar to bad JPEG artifacts.

I don't have great vision, but me neither. They're indistinguishable to me (likewise on mobile).

  • I was on desktop and it looks like pretty heavy jpeg compression. Doesn't completely destroy the image, but it's pretty noticeable when blown up large enough.

It's really noticeable on desktop, like compressing an 800kb jpeg to 50kb. Maybe on mobile you won't notice, but on desktop the image looks blown out.

It took me a minute too but on the fast you can see some blocky artifacting by the elbow and a few spots elsewhere like curtain upper left.