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Contrast ratio results for acer xb240h

Contrast ratio 3566:1 (edge: 1766:1)
Monitor model acer xb240h
Submitted 20 Jun 2019 18:35 CEST, by 107.3.*.*
Camera model Apple iPhone XR
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: 2.9 s (Set EV to +3.5)
Warning: image file 2: automatic white balance can cause inaccuracies.
Note: image file 2: suggested exposure time: 1/150 s (Set EV to -1.4)
Warning: image file 3: automatic white balance can cause inaccuracies.
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 0.6 s (Set EV to +3.1)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.03 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –6.04 stops   (aim for –2 to –3)
Exposure spread 4.08 stops
Area used for calculation 0.766 x 0.766
Camera settings Exposure time: 1/4   ISO: 640   F-number: 1.8
Focal length: 53 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 94 cd/m2
Luminance spread 31 cd/m2 (2 standard deviations)
Exposure value –1.15 stops   (aim for –2 to –3)
Exposure spread 0.48 stops
Area used for calculation 0.766 x 0.766
Camera settings Exposure time: 1/60   ISO: 80   F-number: 1.8
Focal length: 53 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.05 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –5.61 stops   (aim for –2 to –3)
Exposure spread 1.17 stops
Area used for calculation 0.766 x 0.766
Camera settings Exposure time: 1/15   ISO: 1600   F-number: 1.8
Focal length: 53 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.