情况差不多是这样: pi@raspberrypi:~ $ raspistill -t 200 -co 30 -br 75 -w 51 -h 38 -n -o - | convert - -grayscale Rec709Luminance -contrast jpg:- | lp
lp: Error - ~/.cups/lpoptions file names default destination that does not exist.
陆江
2020-07-06