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I open sourced a version of what Evan calls the "webp potato hash" awhile back: https://github.com/transitive-bullshit/lqip-modern

I generally prefer using webp to BlurHash or this version of ThumbHash because it's natively supported and decoded by browsers – as opposed to requiring custom decoding logic which will generally lock up the main thread.

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Small heads-up, you might want to look at the PRs (I've opened the single open PR) :D

Take a look here: https://github.com/ascorbic/unpic-placeholder. Recently created by a Principal Engineer of Netlify, which kind of server-side-renders BlurHash images, so that they don't tax the mainthread. Maybe the same can be done for ThumbHash (I've opened an issue in that repo to discuss it)

FWIW, it can almost certainly be moved off the main thread with OffscreenCanvas, but that has its own set of added complexities.

Edit: word wires got crossed in my brain

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