Contrast ratio results

Black
Contrast ratio	14241:1
Monitor model
Submitted	25 May 2024 16:49 CEST, by 49.196..
Camera model	samsung Galaxy S23
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. 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: 8.3 s (Set EV to +7.0) image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Note: image file 3: suggested exposure time: 1/200 s (Set EV to -0.4) Warning: Image ISO settings are not the same. Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	0.01 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–9.46 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.169 x 0.249
Camera settings	Exposure time: 1/15 ISO: 1250 F-number: 2.2 Focal length: 13 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	100 cd/m2
Luminance spread	21 cd/m2 (2 standard deviations)
Exposure value	–2.37 stops (aim for –2 to –3)
Exposure spread	0.3 stops
Area used for calculation	0.165 x 0.269
Camera settings	Exposure time: 1/500 ISO: 400 F-number: 2.2 Focal length: 13 mm (35 mm equivalent) Exposure compensation: -1
Black at screen edge
Screen photo	[open image]
Luminance	37 cd/m2
Luminance spread	85 cd/m2 (2 standard deviations)
Exposure value	–3.82 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.165 x 0.269
Camera settings	Exposure time: 1/500 ISO: 400 F-number: 2.2 Focal length: 13 mm (35 mm equivalent) Exposure compensation: -1.7

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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.