Contrast ratio results

Black
Contrast ratio	851:1
Monitor model
Submitted	18 Jan 2018 03:39 CET, by 189.202..
Camera model	samsung SAMSUNG-SM-J327A
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: 6.3 s (Set EV to +6.0) Warning: image file 2: automatic white balance can cause inaccuracies. Warning: image file 2: Overexposed. Please decrease the shutter time. Note: image file 2: suggested exposure time: 1/85 s (Set EV to -2.5) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.01 cd/m2
Luminance spread	0.02 cd/m2 (2 standard deviations)
Exposure value	–8.47 stops (aim for –2 to –3)
Exposure spread	2.46 stops
Area used for calculation	0.398 x 0.53
Camera settings	Exposure time: 1/10 ISO: 800 F-number: 1.9 Focal length: 30 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	9 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–-0 stops (aim for –2 to –3)
Exposure spread	0 stops
Area used for calculation	0.398 x 0.53
Camera settings	Exposure time: 1/15 ISO: 500 F-number: 1.9 Focal length: 30 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.