[DaleCurtis]

FWIW, you can do this with a few lines of JS in the browser using canvas.drawImage() from an img element followed by canvas.toBlob().

[valadaptive]

Firefox now adds random noise to all canvas readback operations (getImageData, toDataURL, and toBlob).

[DaleCurtis]

Ah, I didn't realize that always happened. I thought it was only if you did something that might have OS specific rendering characteristics (text-draws, etc).

Maybe having an ImageEncoder API might be worthwhile after all then https://github.com/w3c/webcodecs/issues/204.

[fouc]

That would require a browser that supports WebP

[theandrewbailey]

...which is, like, all of them released over the past 5 years: https://caniuse.com/webp