Contrast ratio results

Black
Contrast ratio	3986:1
Monitor model
Submitted	03 Jan 2021 07:29 CET, by 176.67..
Camera model	Apple iPhone 7
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 2.3 s (Set EV to +0.6) 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	0.09 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–5.7 stops (aim for –2 to –3)
Exposure spread	0.2 stops
Area used for calculation	0.458 x 0.343
Camera settings	Exposure time: 1/4 ISO: 250 F-number: 1.8 Focal length: 28 mm (35 mm equivalent) Exposure compensation: -2.61
White
Screen photo	[open image]
Luminance	339 cd/m2
Luminance spread	16 cd/m2 (2 standard deviations)
Exposure value	–0.06 stops (aim for –2 to –3)
Exposure spread	0.07 stops
Area used for calculation	0.458 x 0.343
Camera settings	Exposure time: 1/320 ISO: 250 F-number: 1.8 Focal length: 28 mm (35 mm equivalent) Exposure compensation: -2.61

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.