Contrast ratio results for xg2401

Contrast ratio 265:1
Monitor model xg2401
Submitted 06 Nov 2019 05:18 CET, by 94.54.*.*
Camera model samsung SM-G960U
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: 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: Images were taken with different cameras.
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
Luminance 0.34 cd/m2
Luminance spread 0.15 cd/m2 (2 standard deviations)
Exposure value –3.1 stops   (aim for –2 to –3)
Exposure spread 0.66 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 0.5   ISO: 400   F-number: 2.6
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 90 cd/m2
Luminance spread 24 cd/m2 (2 standard deviations)
Exposure value –2.26 stops   (aim for –2 to –3)
Exposure spread 0.38 stops
Area used for calculation 0.345 x 0.46
Camera settings Exposure time: 1/350   ISO: 400   F-number: 2.4
Focal length: 26 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.