color.py

#!/usr/bin/env python3
import time
import Quartz


def get_displays():
	err, activeDisplays, _ = Quartz.CGGetActiveDisplayList(6, None, None);
	if err != Quartz.kCGErrorSuccess:
		raise Exception(err)
	return activeDisplays


def main():
	for display in get_displays():
		err = Quartz.CGSetDisplayTransferByFormula(
			display,
			0,1,1, # red
			0,0.85,1, # green
			0,0.7,1, # blue
		)
		if err != Quartz.kCGErrorSuccess:
			raise Exception(err)

	time.sleep(60)

main()