contrast ratio meaning in French

rapport de contraste

To meet the color appearance requirements of the color space, the luminance of the monitor must be 160.00 cd/m2 at the white point, and 0.5557 cd/m2 at the black point, which implies a contrast ratio of 287.9.
De plus, la luminance de l'écran doit être 160 cd m−2 au point blanc et 0,5557 cd m−2 au point noir, ce qui implique un rapport de contraste de 287,9.