It appears to be a color space issue. I’m having trouble reproducing it at the moment but I’ll update this post when it happens again.
Uploading from the account page specifically seems to remove color profile data for some reason.
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I’m on iOS 17 though. It works fine with HEIC also from Damus. But it most likely is a color space issue.
Fixed for PNGs now, had issues with pngquant being out of date and with no profile support (thanks Semi for spotting it)
