This topic is locked.

What are jpeg artifacts and why does it matter if a picture has it or not
Sooo i'm rather clueless about jpeg artifacts and can't see the actual point of why they are a problem they are difficult to spot so i honestly don't get it why it's so nitpicky.
I'm kinda coming down right now and I feel sad and my head hurts, and I've never been good at describing things like this, but it's those...fuzzy, shitty spots present in certain pieces of art.

Lemme see if I can find a good picture as an example... Hold on...

Kay. See her hair? All those messed up looking places? Those are artifacts.

We've always drawn a hard line with them, unlike a lot of other boorus.

When they're bad enough that even I can see them (I have bad eyes), it gets deleted.

P.S.
Link you sent gives me a 403 Forbidden error.
PrimalAgony said:
Link you sent gives me a 403 Forbidden error.
https://danbooru.donmai.us/posts/3878099

What about that one?

It also might've worked if you just hit enter again but there's the Danbooru page.
It's the blurry parts yea?
PrimalAgony said:
It's the blurry parts yea?
Exactly. Like visual static. Those are "JPEG artifacts". When they're that easy to see, it's pretty much an automatic deletion.

Sometimes there are artifacts that I miss, but BattlequeenYume spots them better than I do.
Well i've lost the motivation to upload more pictures for now, Got the answer i was looking for lock the thread or whatevs.
PrimalAgony said:
Well i've lost the motivation to upload more pictures for now, Got the answer i was looking for lock the thread or whatevs.
Awwwh. Well don't feel too bad. I was really shit at it at first myself. And a lot of the popular stuff always gets sniped.
Since the answer didn't explain why they occur and didn't really touch on why it matters, I felt like adding a bit more information.

BTW, when someone asks a question like this about artifacts, you should point them to section 2 of the Image Quality Evaluation page. That explains it fairly well and has some good examples. It helps a lot to be able to compare multiple copies of the same image with different levels of artifacting.

To put it really simply though, artifacts are the result of a sacrifice in image quality for the sake of minimizing file size. PNG compression never sacrifices image quality. But JPEG compression essentially always does.

Though, if you use the highest quality JPEG settings, even the sharpest eyes shouldn't be able to discern the difference. (When zoomed in switching back and forth between the two, you might see a very slight difference, but not enough to tell which is the JPEG version).

This is a site for high quality wallpapers. Artifacts lower the image quality, so we don't allow images that have too many.
Sorry Zolxys. Thank you Zolxys.
As much as i appriciate your input Zolxys, Emmy did a good job at explaining the answer i was looking for so no need to rub salt in the wound.
For a more technical explanation.
Yes yes yes lock the thread again please.