Contrast ratio results

Black
Contrast ratio	85:1
Monitor model
Submitted	05 Aug 2021 22:55 CEST, by 187.183..
Camera model	samsung SM-A307GT
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Note: image file 1: suggested exposure time: 0.3 s (Set EV to -1.5) Warning: image file 2: automatic white balance can cause inaccuracies. Warning: Image ISO settings are not the same. Warning: Image F-number settings are not the same. Warning: Image focal lengths/zoom levels are not the same.
Screen photo	[open image]
Luminance	0.04 cd/m2
Luminance spread	0.02 cd/m2 (2 standard deviations)
Exposure value	–2.5 stops (aim for –2 to –3)
Exposure spread	0.76 stops
Area used for calculation	0.358 x 0.477
Camera settings	Exposure time: 0.9 ISO: 1250 F-number: 1.7 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	3.3 cd/m2
Luminance spread	0.57 cd/m2 (2 standard deviations)
Exposure value	–0.97 stops (aim for –2 to –3)
Exposure spread	0.25 stops
Area used for calculation	0.172 x 0.23
Camera settings	Exposure time: 1 ISO: 64 F-number: 2.2 Focal length: 13 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.