Contrast ratio results

Black
Contrast ratio	1905:1
Monitor model
Submitted	09 Sep 2015 23:19 CEST, by 81.67..
Camera model	Apple iPhone 6
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. 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. Note: image file 1: suggested exposure time: 1.9 s (Set EV to +4.8) Warning: image file 2: automatic white balance can cause inaccuracies. image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 2: Overexposed. Please decrease the shutter time. Note: image file 2: suggested exposure time: 1/130 s (Set EV to -2.4) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.02 cd/m2
Luminance spread	0.02 cd/m2 (2 standard deviations)
Exposure value	–7.31 stops (aim for –2 to –3)
Exposure spread	1.66 stops
Area used for calculation	0.419 x 0.419
Camera settings	Exposure time: 1/15 ISO: 2000 F-number: 2.2 Focal length: 29 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	37 cd/m2
Luminance spread	19 cd/m2 (2 standard deviations)
Exposure value	–0.1 stops (aim for –2 to –3)
Exposure spread	0.76 stops
Area used for calculation	0.419 x 0.419
Camera settings	Exposure time: 1/24 ISO: 250 F-number: 2.2 Focal length: 29 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.