Contrast ratio results

Contrast ratio 2:1
Monitor model
Submitted 14 Jul 2020 21:26 CEST, by 185.112.*.*
Camera model Canon EOS 600D
Processing remarks

image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: Image F-number settings are not the same.
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
Luminance 4.33 cd/m2
Luminance spread 9.88 cd/m2 (2 standard deviations)
Exposure value –2.36 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.546 x 0.614
Camera settings Exposure time: 1/32   ISO: 400   F-number: 1.8
Focal length: 39.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 8 cd/m2
Luminance spread 16 cd/m2 (2 standard deviations)
Exposure value –1.85 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.524 x 0.589
Camera settings Exposure time: 1/25   ISO: 400   F-number: 2.3
Focal length: 37.7 mm   (35 mm equivalent)
Exposure compensation: 0

The luminance values in cd/m2 are not very reliable, since camera sensitivities can easily differ up to 50% from their nominal value. Typically, the real luminance is 30% lower than this number. The area used for calculation is chosen such that it corresponds to a viewing angle of ±14° horizontally and ±10.5° vertically, which is equivalent to viewing the screen from a distance of about 1.5 times the diagonal size.

Unfortunately, there is a lot of variation in how cameras use EXIF settings. If photos from your camera your produce unusable results, try coming back in a few days. I review submitted pictures regularly and try to fix problems.