Contrast ratio results

Black
Contrast ratio	3359:1
Monitor model
Submitted	31 Mar 2020 04:48 CEST, by 23.129..
Camera model	unknown
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: 2.9 s (Set EV to +2.5) Warning: image file 2: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	0.02 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–5.03 stops (aim for –2 to –3)
Exposure spread	0.86 stops
Area used for calculation	0.357 x 0.48
Camera settings	Exposure time: 0.5 ISO: 800 F-number: 1.6 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	56 cd/m2
Luminance spread	6 cd/m2 (2 standard deviations)
Exposure value	–1.29 stops (aim for –2 to –3)
Exposure spread	0.16 stops
Area used for calculation	0.359 x 0.474
Camera settings	Exposure time: 1/500 ISO: 800 F-number: 1.6 Focal length: 27 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.