Contrast ratio of LG 25UM56

Contrast ratio 686:1
Monitor model LG 25UM56
Submitted 24 Mar 2022 04:47 CET, by 152.169.*.*
Camera model samsung SM-G975U1
Processing remarks


Black
Screen photo
Luminance 0.44 cd/m2
Luminance spread 0.15 cd/m2 (2 standard deviations)
Exposure value –1.49 stops   (aim for –2 to –3)
Exposure spread 0.5 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 1   ISO: 400   F-number: 2.4
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: -2
White
Screen photo
Luminance 301 cd/m2
Luminance spread 23 cd/m2 (2 standard deviations)
Exposure value –1.03 stops   (aim for –2 to –3)
Exposure spread 0.11 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 1/500   ISO: 400   F-number: 2.4
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: -2

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.