I just uploaded about 6 or 7 images of sailor pluto from sailor moon because they weren't already on the site and I thought there were worth adding :3 they were all just deleted within five minutes. Can somebody just tell me why? Am I missing a rule or something? I dun understand :3

They had very noticeable artifacts.

Sorry if it's a dumb question, but what does that mean? =/

It means the quality was crap.

I have an idea! Umm ... that's two in one week. I'm either on a roll or I've used up all my luck for the next month.

Anyway, I'd like to see some good examples of these compression artifacts, accessible from Gelbooru, rather than having to go looking all over the 'net for them. I've seen some images tagged as having artifacts and I honestly don't see anything wrong with them. Could we possibly gather together, in one spot, maybe through the use of a tag like "artifact_example", and show exactly what people are talking about using the sorts of images we have on this board? Ideally, a range of images, beginning with a perfect one with no artifacts, and then showing increasingly annoying examples of artifacts (using the same image), thereby giving all of us who are relatively clueless about this, a basis for comparison.

Are .gif and .jpg artifacts different (I've seen images flagged on various sites as having one or the other -- how do you know?), and is one more "acceptable" than the other? Are there other sorts of artifacts we need to be watching out for?

I could post some in the help documentation area. I really don't want any examples (of artifacts) to remain on the site, unless of course it is proven to be the original copy.

That would work, and I think it would be a great help for those of us who are having a problem wrapping our brains around the whole issue of artifacts. If you could start with an artifact-free image, and then convert it to lossy formats (and I understand you can get degrees of "lossiness" that affect the quality of an image differently) that would be ideal. Then we could do a side-by-side comparison, which is a lot easier to understand than showing one image without and then an entirely different image with.

Also, are there degrees of degradation that are acceptable to post, here? I would think there would be, since aren't there some formats that introduce artifacts regardless of what you do? If so, it would be helpful in a range of images to indicate the one at which the degradation becomes unacceptable for this board.

Ok, that all makes sense now. Sorry about the postings. I'll be sure to check everything from now on.