Contrast ratio results

Black
Contrast ratio	3839:1
Monitor model
Submitted	01 Jul 2021 18:41 CEST, by 103.139..
Camera model	Sony ILCE-7M3
Processing remarks	image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 16.8 s (Set EV to +2.8) image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.06 cd/m2
Luminance spread	0.08 cd/m2 (2 standard deviations)
Exposure value	–5.25 stops (aim for –2 to –3)
Exposure spread	2.52 stops
Area used for calculation	0.347 x 0.391
Camera settings	Exposure time: 2.5 ISO: 400 F-number: 5 Focal length: 25 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	215 cd/m2
Luminance spread	55 cd/m2 (2 standard deviations)
Exposure value	–2.31 stops (aim for –2 to –3)
Exposure spread	0.37 stops
Area used for calculation	0.347 x 0.391
Camera settings	Exposure time: 1/50 ISO: 100 F-number: 5 Focal length: 25 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.