Contrast ratio results

Black
Contrast ratio	28:1
Monitor model
Submitted	22 Jan 2017 00:44 CET, by 130.88..
Camera model	HUAWEI VNS-L31
Processing remarks	Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. 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. Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Screen photo	[open image]
Luminance	3.05043e+07 cd/m2
Luminance spread	5.55523e+06 cd/m2 (2 standard deviations)
Exposure value	–6.81 stops (aim for –2 to –3)
Exposure spread	0.26 stops
Area used for calculation	0.635 x 0.269
Camera settings	Exposure time: 1/99996336 ISO: 100 F-number: 2 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	8.67855e+08 cd/m2
Luminance spread	2.90729e+07 cd/m2 (2 standard deviations)
Exposure value	–1.98 stops (aim for –2 to –3)
Exposure spread	0.05 stops
Area used for calculation	0.635 x 0.269
Camera settings	Exposure time: 1/99996336 ISO: 100 F-number: 2 Focal length: 27 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.