Contrast ratio results

Black
Contrast ratio	23047:1
Monitor model
Submitted	15 Feb 2024 20:27 CET, by 37.150..
Camera model	Xiaomi Redmi Note 9 Pro
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: 30.5 s (Set EV to +6.9) Warning: image file 2: automatic white balance can cause inaccuracies. image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–9.43 stops (aim for –2 to –3)
Exposure spread	1.68 stops
Area used for calculation	0.383 x 0.33
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 1.9 Focal length: 25 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	103 cd/m2
Luminance spread	16 cd/m2 (2 standard deviations)
Exposure value	–1.58 stops (aim for –2 to –3)
Exposure spread	0.23 stops
Area used for calculation	0.37 x 0.347
Camera settings	Exposure time: 1/400 ISO: 400 F-number: 1.9 Focal length: 25 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.