Contrast ratio results

Black
Contrast ratio	124083:1
Monitor model
Submitted	07 Nov 2016 15:26 CET, by 93.17..
Camera model	ulefone Power
Processing remarks	Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 236.0 s (Set EV to +13.2) Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–12.7 stops (aim for –2 to –3)
Exposure spread	0.61 stops
Area used for calculation	0.528 x 0.223
Camera settings	Exposure time: 1/5 ISO: 400 F-number: 1.8 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 3
White
Screen photo	[open image]
Luminance	64 cd/m2
Luminance spread	2 cd/m2 (2 standard deviations)
Exposure value	–2.03 stops (aim for –2 to –3)
Exposure spread	0.04 stops
Area used for calculation	0.528 x 0.223
Camera settings	Exposure time: 1/380 ISO: 400 F-number: 1.8 Focal length: 0 mm (35 mm equivalent) Exposure compensation: -1

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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.