Contrast ratio results

Contrast ratio 644:1
Monitor model
Submitted 01 Jan 2018 01:38 CET, by 91.130.*.*
Camera model Panasonic DMC-GX7
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 1.2 s (Set EV to +6.9)
Warning: image file 2: Overexposed. Please decrease the shutter time.

Black
Screen photo
Luminance 0.25 cd/m2
Luminance spread 0.24 cd/m2 (2 standard deviations)
Exposure value –9.4 stops   (aim for –2 to –3)
Exposure spread 1.53 stops
Area used for calculation 0.636 x 0.505
Camera settings Exposure time: 1/100   ISO: 400   F-number: 2.8
Focal length: 40 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 159 cd/m2
Luminance spread 6 cd/m2 (2 standard deviations)
Exposure value –0.07 stops   (aim for –2 to –3)
Exposure spread 0.05 stops
Area used for calculation 0.654 x 0.49
Camera settings Exposure time: 1/100   ISO: 400   F-number: 2.8
Focal length: 40 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.