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Re:How are images compressed? An explanation of JPEG [video] by GeertJohan on Tuesday June 28, 2022 @08:12AM (#31906674)
The QOI format is relatively easy to understand, explained in a single page pdf file. I found it very interesting, knowing nothing of image encoding/compression.

https://qoiformat.org/

Re:How are images compressed? An explanation of JPEG [video] by vanderZwan on Wednesday June 29, 2022 @05:02AM (#31917873)
It's great but it's an entirely different beast, being both lossless and designed to be fast and minimal above everything else. It works by minimizing the overhead of encoding deltas and run-lengths.