Contrast ratio results

Black
Contrast ratio	3:1
Monitor model
Submitted	27 Apr 2019 16:18 CEST, by 14.139..
Camera model	OnePlus A3003
Processing remarks	image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 21.6 s (Set EV to +4.4) image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 2: Underexposed. Please increase the shutter time. Note: image file 2: suggested exposure time: 69.3 s (Set EV to +6.1) image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–8.62 stops (aim for –2 to –3)
Exposure spread	1.06 stops
Area used for calculation	0.403 x 0.408
Camera settings	Exposure time: 1 ISO: 400 F-number: 2 Focal length: 28 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	0.01 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–6.93 stops (aim for –2 to –3)
Exposure spread	1.31 stops
Area used for calculation	0.391 x 0.431
Camera settings	Exposure time: 1 ISO: 400 F-number: 2 Focal length: 28 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	71 cd/m2
Luminance spread	7 cd/m2 (2 standard deviations)
Exposure value	–2.26 stops (aim for –2 to –3)
Exposure spread	0.14 stops
Area used for calculation	0.417 x 0.384
Camera settings	Exposure time: 1/400 ISO: 400 F-number: 2 Focal length: 28 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.