completely corrupt ‘won’t open’ broken

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trying a bit of glitch code on a threshold gif. As simple, apparently, as moving or deleting a few lines of the code.

Getting at the code is as easy as changing the file extension from .jpg to .txt. Getting a decent glitch is harder - so far I’m at the two extremes - either no discernable difference or else completely corrupt ‘won’t open’ broken - the description trips off the tongue, which is something I guess.