this post was submitted on 11 Oct 2023
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is it a formatting step that an image goes through when uploaded? I'm tired of converting image after image back into jpg, so if there's like a step I can take to avoid it being a webp, it would help to know

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[–] [email protected] 15 points 1 year ago* (last edited 1 year ago) (1 children)

Minor niggle: the ‘deep fried effect’ isn’t because jpg throws away information every time, it’s because the compression algorithm averages pixel boundaries, and that averaging multiplies with each compression pass.

It can actually bloat the size of the file by adding information – adding data to previously null pixels, whereas png would keep them clean.

e: it achieves this through pixel averaging (fuzzing), which is why you’ll see grey artefacts bleeding into the pixels around line art. This is magnified with each compression.

[–] [email protected] 18 points 1 year ago (2 children)

You’re conflating “data” with “information”.

Repeated re-encoding loses information. “The compression algorithm averages pixel boundaries” is a perfect example of losing information.
That it sometimes results in more bits of data is a separate phenomenon altogether.

[–] [email protected] 9 points 1 year ago

Thank you I learned something today.

[–] [email protected] 4 points 1 year ago* (last edited 1 year ago)

That’s fair. Thank you for making that distinction.

e: It’s still bad for the user, though.