Contrast ratio results

Black
Contrast ratio	3799:1
Monitor model
Submitted	10 Jan 2020 22:47 CET, by 135.0..
Camera model	Apple iPhone 6s
Processing remarks	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: 2.4 s (Set EV to +3.2) image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 2: Overexposed. Please decrease the shutter time.
Screen photo	[open image]
Luminance	0.16 cd/m2
Luminance spread	0.03 cd/m2 (2 standard deviations)
Exposure value	–5.74 stops (aim for –2 to –3)
Exposure spread	0.32 stops
Area used for calculation	0.558 x 0.314
Camera settings	Exposure time: 1/4 ISO: 200 F-number: 2.2 Focal length: 29 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	589 cd/m2
Luminance spread	166 cd/m2 (2 standard deviations)
Exposure value	–0.49 stops (aim for –2 to –3)
Exposure spread	0.41 stops
Area used for calculation	0.558 x 0.314
Camera settings	Exposure time: 1/400 ISO: 200 F-number: 2.2 Focal length: 29 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.