Contrast ratio results

Black
Contrast ratio	1:1
Monitor model
Submitted	06 Dec 2017 21:03 CET, by 31.155..
Camera model	Canon EOS 7D Mark II
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: Overexposed. Please decrease the shutter time. Warning: image file 2: camera was zoomed in too much. image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Note: image file 2: suggested exposure time: 1/370 s (Set EV to -1.6) Warning: image file 3: camera was zoomed in too much. image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: Image ISO settings are not the same. Warning: Image F-number settings are not the same. Warning: Image focal lengths/zoom levels are not the same. Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	228 cd/m2
Luminance spread	426 cd/m2 (2 standard deviations)
Exposure value	–1.6 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/160 ISO: 400 F-number: 4.5 Focal length: 72.2 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	277 cd/m2
Luminance spread	345 cd/m2 (2 standard deviations)
Exposure value	–0.95 stops (aim for –2 to –3)
Exposure spread	2.1 stops
Area used for calculation	1 x 0.921
Camera settings	Exposure time: 1/125 ISO: 500 F-number: 5 Focal length: 120 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	47 cd/m2
Luminance spread	62 cd/m2 (2 standard deviations)
Exposure value	–1.53 stops (aim for –2 to –3)
Exposure spread	2.32 stops
Area used for calculation	1 x 0.5
Camera settings	Exposure time: 1/100 ISO: 500 F-number: 2.8 Focal length: 80.2 mm (35 mm equivalent) Exposure compensation: 0

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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.