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Contrast ratio results for HP ZR2740W

Contrast ratio 4842:1
Monitor model HP ZR2740W
Submitted 20 Aug 2022 22:14 CEST, by 81.183.*.*
Camera model Xiaomi M2011K2G
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 4.0 s (Set EV to +4.6)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 2: automatic white balance can cause inaccuracies.

Black
Screen photo
[open image]
Luminance 0.03 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –7.1 stops   (aim for –2 to –3)
Exposure spread 0.21 stops
Area used for calculation 0.481 x 0.271
Camera settings Exposure time: 1/6   ISO: 400   F-number: 1.8
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 146 cd/m2
Luminance spread 3 cd/m2 (2 standard deviations)
Exposure value –1.92 stops   (aim for –2 to –3)
Exposure spread 0.03 stops
Area used for calculation 0.481 x 0.271
Camera settings Exposure time: 1/800   ISO: 400   F-number: 1.8
Focal length: 25 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.