Contrast ratio results for acer

Black
Contrast ratio	89:1
Monitor model	acer
Submitted	24 Sep 2019 19:30 CEST, by 90.3..
Camera model	Xiaomi POCO F1
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 2: automatic white balance can cause inaccuracies. image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Note: image file 2: suggested exposure time: 39.2 s (Set EV to -1.3) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–2.79 stops (aim for –2 to –3)
Exposure spread	1.04 stops
Area used for calculation	0.265 x 0.354
Camera settings	Exposure time: 33.1 ISO: 9600 F-number: 1.9 Focal length: 20 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	0.01 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–1.15 stops (aim for –2 to –3)
Exposure spread	0.33 stops
Area used for calculation	0.265 x 0.354
Camera settings	Exposure time: 99.7 ISO: 112 F-number: 1.9 Focal length: 20 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.