alias jpeg_artifacts -> compression_artifacts

BUR #10302 has been rejected.

create alias jpeg_artifacts -> compression_artifacts

jpeg artifacts are a type of compression compression artifact, but jpeg suggests jpeg, or at least image. There are other posts that are not jpegs or images that have this tag (jpeg_artifacts -filetype:jpg, jpeg_artifacts animated). Renaming to compression_artifacts encompasses both of these.

You don't need the second line since the antecedent is already a meta tag. Though I don't see why it is if we're using meta tags to tag things not present in the image, which compression artefacts definitely are.

It's a meta tag for the same reason cropped and decensored are meta tags; it's based on alterations to the image that presumably did not exist in the original. It's a reasonable assumption that artists work in PSD or equivalent filetypes rather than in JPEG.

Also, as evazion noted, uploaders copying jpeg_artifacts from child posts to parent posts (often PNGs on Pixiv) was a common mistake, and it was hoped that the prominence of meta tags would help alleviate this.

Talulah said:

You don't need the second line since the antecedent is already a meta tag. Though I don't see why it is if we're using meta tags to tag things not present in the image, which compression artefacts definitely are.

Removed. The meta debate for artifacts comes from topic #14713 and topic #14678. Since they agreed that artifacts are meta, this should still follow that convention. Reopen the debate in another BUR.

Good chunk of jpeg_artifacts -filetype:jpg are jpegs resaved as pngs (e.g. post #2500981), artists being artists by reusing jpegs in their own artwork (e.g. post #3638544), taggers being blind and confusing it with other image defects (e.g. post #4929889 color banding was tagged as jpeg artifacts) or some weird stuff like post #2378424. jpeg_artifacts animated are people confusing h264 artifacts as jpeg artifacts, because both use DCT algorithms to compress the data.

If you want to generalise, dct_artifacts might be a better tag, since DCT artifacts are distinct from other kinds of compression artifacts. Otherwise I see no point in proposed alias, better do some gardening.

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The bulk update request #10302 (forum #212511) has been rejected by @DanbooruBot.