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bikini cube_x_cursed_x_curious fumio guilty_crown headphones monochrome sonico sovereignty super_sonico swimsuits ura-fmo yuzuriha_inori

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Don't be shocked.
Ok...
The png is probably using some lower quality b&w binary scale.
Considering jpegs aren't meant for that use but pngs can cope with it just fine, doesn't seem that surprising.