Contrast ratio results

Black
Contrast ratio	14955:1
Monitor model
Submitted	10 May 2019 14:34 CEST, by 84.236..
Camera model	HUAWEI FRD-L09
Processing remarks	Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. 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. image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Screen photo	[open image]
Luminance	14455 cd/m2
Luminance spread	17066 cd/m2 (2 standard deviations)
Exposure value	–16.13 stops (aim for –2 to –3)
Exposure spread	1.96 stops
Area used for calculation	0.635 x 0.269
Camera settings	Exposure time: 1/99996336 ISO: 400 F-number: 2.2 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 4
White
Screen photo	[open image]
Luminance	2.16161e+08 cd/m2
Luminance spread	8.25325e+07 cd/m2 (2 standard deviations)
Exposure value	–2.26 stops (aim for –2 to –3)
Exposure spread	0.56 stops
Area used for calculation	0.635 x 0.269
Camera settings	Exposure time: 1/99996336 ISO: 400 F-number: 2.2 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 4

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.