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jessikitty
a77d42a1e4
A thermal head has no grey, so an undithered photo gets thresholded into a solid black mass — measured at 98% black coverage on a test portrait, against 44% once dithered. Auto-levels first, because typical webcam captures sit in the middle of the range and dithering those directly gives flat mush. Serpentine scan order to avoid diagonal banding across skin tones.