You could use a color calibration chart.
https://www.bhphotovideo.com/c/product/1014557-REG/dgk_color_tools_dkk_set_of_2_dkk_poly_bag_2.html/?ap=y&gclid=Cj0KCQiAzKnjBRDPARIsAKxfTRBpRuHuYs0_Z8WzcbIA-PpgzPVfpZuK-jwcBMVVAPuTAlUMQvpO09AaAho_EALw_wcB&lsft=BI%3A514&smp=Y
How to use one:
