Contrast ratio results

Black
Contrast ratio	1275:1
Monitor model
Submitted	09 Dec 2020 16:18 CET, by 62.201..
Camera model	Xiaomi Mi A2 Lite
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 file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 0.3 s (Set EV to +2.1) Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 2: automatic white balance can cause inaccuracies. Note: image file 2: suggested exposure time: 1/99 s (Set EV to -1.6) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.04 cd/m2
Luminance spread	0.03 cd/m2 (2 standard deviations)
Exposure value	–4.56 stops (aim for –2 to –3)
Exposure spread	1.5 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/13 ISO: 6400 F-number: 2.2 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	45 cd/m2
Luminance spread	11 cd/m2 (2 standard deviations)
Exposure value	–0.91 stops (aim for –2 to –3)
Exposure spread	0.34 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/33 ISO: 160 F-number: 2.2 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0

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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.