Contrast ratio is defined as the luminance ratio of the brightest (white) and darkest (black) state of the display.
A contrast ratio of 500 means that the luminance level of the white area in the image is 500 times brighter than that of the black area.

There are two commonly used methods measuring Contrast.

ANSI contrast method	Full On/Off contrast method

When comparing values between the ANSI method and Full on/off method, the values of the Full on/off method are usually higher.

For emissive displays and projection screens the Brontes and Brontes-LL are cost effective solutions for production environment measurements.
For E-reader measurements the Arges45 and Vates are pefect solutions. Additional features include gloss measurement.