Contrast ratio results

Black
Contrast ratio	808116:1
Monitor model
Submitted	27 Sep 2026 09:45 CEST, by 200.36..
Camera model	Apple iPhone 13
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 89.5 s (Set EV to +8.8) Warning: image file 2: automatic white balance can cause inaccuracies. Warning: image file 2: Overexposed. Please decrease the shutter time. Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–13.15 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.376 x 0.376
Camera settings	Exposure time: 1/18 ISO: 1000 F-number: 1.6 Focal length: 26 mm (35 mm equivalent) Exposure compensation: -1.85
White
Screen photo	[open image]
Luminance	350 cd/m2
Luminance spread	4 cd/m2 (2 standard deviations)
Exposure value	–0.23 stops (aim for –2 to –3)
Exposure spread	0.02 stops
Area used for calculation	0.376 x 0.376
Camera settings	Exposure time: 1/120 ISO: 64 F-number: 1.6 Focal length: 26 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.