Contrast ratio results

Black
Contrast ratio	1955:1
Monitor model
Submitted	20 Mar 2023 20:52 CET, by 146.75..
Camera model	Apple iPhone 13 Pro
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: 1.0 s (Set EV to +1.5) Warning: image file 2: automatic white balance can cause inaccuracies. Warning: image file 2: Overexposed. Please decrease the shutter time. Note: image file 2: suggested exposure time: 1/410 s (Set EV to -2.0) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.16 cd/m2
Luminance spread	0.22 cd/m2 (2 standard deviations)
Exposure value	–5.02 stops (aim for –2 to –3)
Exposure spread	2.43 stops
Area used for calculation	0.202 x 0.202
Camera settings	Exposure time: 1/6 ISO: 320 F-number: 1.8 Focal length: 14 mm (35 mm equivalent) Exposure compensation: -1.05
White
Screen photo	[open image]
Luminance	312 cd/m2
Luminance spread	23 cd/m2 (2 standard deviations)
Exposure value	–0.46 stops (aim for –2 to –3)
Exposure spread	0.1 stops
Area used for calculation	0.202 x 0.202
Camera settings	Exposure time: 1/99 ISO: 64 F-number: 1.8 Focal length: 14 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.