Contrast ratio results

Black
Contrast ratio	1298:1
Monitor model
Submitted	26 Mar 2021 23:51 CET, by 213.149..
Camera model	samsung SM-G920F
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: 1.1 s (Set EV to +3.1) Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. Warning: image file 2: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	0.13 cd/m2
Luminance spread	0.29 cd/m2 (2 standard deviations)
Exposure value	–5.58 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.458 x 0.343
Camera settings	Exposure time: 1/8 ISO: 400 F-number: 1.9 Focal length: 28 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	168 cd/m2
Luminance spread	14 cd/m2 (2 standard deviations)
Exposure value	–1.79 stops (aim for –2 to –3)
Exposure spread	0.12 stops
Area used for calculation	0.458 x 0.343
Camera settings	Exposure time: 1/750 ISO: 400 F-number: 1.9 Focal length: 28 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.