Contrast ratio results

Black
Contrast ratio	197:1
Monitor model
Submitted	20 Oct 2019 19:06 CEST, by 74.135..
Camera model	BlackBerry Passport
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 2: automatic white balance can cause inaccuracies. Note: image file 2: suggested exposure time: 1/170 s (Set EV to -1.5) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.9 cd/m2
Luminance spread	0.21 cd/m2 (2 standard deviations)
Exposure value	–2.69 stops (aim for –2 to –3)
Exposure spread	0.34 stops
Area used for calculation	0.49 x 0.368
Camera settings	Exposure time: 1/15 ISO: 888 F-number: 2 Focal length: 30 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	177 cd/m2
Luminance spread	9 cd/m2 (2 standard deviations)
Exposure value	–1 stops (aim for –2 to –3)
Exposure spread	0.07 stops
Area used for calculation	0.49 x 0.368
Camera settings	Exposure time: 1/60 ISO: 58 F-number: 2 Focal length: 30 mm (35 mm equivalent) Exposure compensation: 0

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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.