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A shell script to add "Kurosawa mode" (as implemented in the videogame Ghost of Tsushima) to your webcam, tested with a Logitech c920 on Ubuntu. Run "bash kurosawa.sh on" or make it an executable and run `kurosawa on` to activate high-contrast black-and-white; run with "off" to disable/reset.
#!/usr/bin/env bash
MODE="$1"
if [ $MODE = "on" ]; then
v4l2-ctl -d /dev/video0 --set-ctrl=saturation=0,contrast=190,brightness=105
elif [ $MODE = "off" ]; then
v4l2-ctl -d /dev/video0 --set-ctrl=saturation=128,contrast=128,brightness=120
fi
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