Contrast ratio results

Black
Contrast ratio	1:1
Monitor model
Submitted	05 Dec 2018 11:03 CET, by 130.225..
Camera model	OnePlus A5010
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: 0.7 s (Set EV to +1.5) Warning: image file 3: automatic white balance can cause inaccuracies. image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Note: image file 3: suggested exposure time: 0.7 s (Set EV to +1.5) Warning: Image ISO settings are not the same. Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	0.1 cd/m2
Luminance spread	0.11 cd/m2 (2 standard deviations)
Exposure value	–2.59 stops (aim for –2 to –3)
Exposure spread	1.71 stops
Area used for calculation	0.347 x 0.347
Camera settings	Exposure time: 4 ISO: 100 F-number: 1.7 Focal length: 24 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	0.15 cd/m2
Luminance spread	0.04 cd/m2 (2 standard deviations)
Exposure value	–4.01 stops (aim for –2 to –3)
Exposure spread	0.37 stops
Area used for calculation	0.325 x 0.398
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 1.7 Focal length: 24 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0.15 cd/m2
Luminance spread	0.04 cd/m2 (2 standard deviations)
Exposure value	–4.01 stops (aim for –2 to –3)
Exposure spread	0.37 stops
Area used for calculation	0.325 x 0.398
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 1.7 Focal length: 24 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.