Simple Demonstration of RGB vs CMYK Colorspaces
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random grid

host software for an led art installation

waits for serial communication containing an rgb value, upon receiving converts the rgb value to cmyk color space, renders a png with a shape consisting of that solid color in cmyk color space, and then prints it out on a cmyk printer.

Find printer name: lpstat -p -d

/dev/tty.usbserial-A900adQD with 9600 baud