Contrast ratio results for vg249q1a

Black
Contrast ratio	2553:1
Monitor model	vg249q1a
Submitted	10 Jun 2023 01:00 CEST, by 45.13..
Camera model	Xiaomi Redmi Note 7
Processing remarks	Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 1: automatic white balance can cause inaccuracies. Note: image file 1: suggested exposure time: 1/6 s (Set EV to +1.1) Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 2: automatic white balance can cause inaccuracies. Note: image file 2: suggested exposure time: 1/250 s (Set EV to -1.3) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.05 cd/m2
Luminance spread	0.04 cd/m2 (2 standard deviations)
Exposure value	–3.64 stops (aim for –2 to –3)
Exposure spread	1.15 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/14 ISO: 6400 F-number: 1.8 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	124 cd/m2
Luminance spread	27 cd/m2 (2 standard deviations)
Exposure value	–1.16 stops (aim for –2 to –3)
Exposure spread	0.31 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/100 ISO: 100 F-number: 1.8 Focal length: 0 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.