I don't think whatever method you're using to convert the image to PCM samples is correct/useful. Here are my results for MP3, Vorbis, Opus, at default settings, with the image interpreted as 8-bit mono samples.pic.twitter.com/pIoq2yuSBk
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You can see that the noise isn't nearly as bad (these formats do not murder the data *that* much), and it's also clear that MP3 does not preserve the boundaries because it does not support seamless playback (which causes the horizontal shift and color change due to RGB mismatch).
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Meanwhile in the Opus output you can clearly see the effect of the DC removal filter, which means solid areas tend towards grey.
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FWIW this is what I used: convert img_MIKU_us.png -depth 8 rgb:- | sox -t raw -r 44100 -c1 -b 8 -e unsigned-integer - -t wav - | opusenc - - | sox -t opus - -t raw -r 44100 -c1 -b 8 -e unsigned-integer - | convert -size 462x710 -depth 8 rgb:- miku_opus.png
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