Contrast ratio results

Black
Contrast ratio	1403:1
Monitor model
Submitted	09 Oct 2024 16:42 CEST, by 84.209..
Camera model	Apple iPhone 13 Pro
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Note: image file 1: suggested exposure time: 1/4 s (Set EV to +1.6) Warning: image file 2: automatic white balance can cause inaccuracies. Note: image file 2: suggested exposure time: 1/370 s (Set EV to -1.6) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.22 cd/m2
Luminance spread	0.14 cd/m2 (2 standard deviations)
Exposure value	–4.01 stops (aim for –2 to –3)
Exposure spread	0.9 stops
Area used for calculation	0.376 x 0.376
Camera settings	Exposure time: 1/12 ISO: 640 F-number: 1.5 Focal length: 26 mm (35 mm equivalent) Exposure compensation: 0.137
White
Screen photo	[open image]
Luminance	314 cd/m2
Luminance spread	31 cd/m2 (2 standard deviations)
Exposure value	–0.88 stops (aim for –2 to –3)
Exposure spread	0.14 stops
Area used for calculation	0.376 x 0.376
Camera settings	Exposure time: 1/120 ISO: 40 F-number: 1.5 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.