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Ah, well done!
Reminded me of the time I finally got some scans of old Belgian comics and they had diagonal stripes all through them, a common artifact of scanning at the time.
The answer was using imagemagick and fast Fourrier transforms to isolate the stripes and filter them out! Led me down an awesome rabbithole of math and digital imaging I still haven’t recovered from.
Mind to share your scripts? If it was that common for a time…
TL,DR: Sorcery.

