Contrast ratio results

Black
Contrast ratio	200:1 (edge: 40:1)
Monitor model
Submitted	07 May 2017 22:10 CEST, by 188.87..
Camera model	Canon EOS 100D
Processing remarks	Warning: image file 1: camera was zoomed in too much. 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: 2.2 s (Set EV to +5.8) Warning: image file 2: automatic white balance can cause inaccuracies. image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 2: Overexposed. Please decrease the shutter time. Note: image file 2: suggested exposure time: 1/120 s (Set EV to -2.2) Warning: image file 3: automatic white balance can cause inaccuracies. image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 3: Underexposed. Please increase the shutter time. Note: image file 3: suggested exposure time: 0.3 s (Set EV to +3.1) Warning: Image F-number settings are not the same. Warning: Image focal lengths/zoom levels are not the same.
Screen photo	[open image]
Luminance	0.56 cd/m2
Luminance spread	1.1 cd/m2 (2 standard deviations)
Exposure value	–8.28 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/25 ISO: 400 F-number: 5.7 Focal length: 87.2 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	112 cd/m2
Luminance spread	96 cd/m2 (2 standard deviations)
Exposure value	–0.26 stops (aim for –2 to –3)
Exposure spread	1.33 stops
Area used for calculation	0.55 x 0.619
Camera settings	Exposure time: 1/25 ISO: 400 F-number: 5 Focal length: 39.6 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	2.82 cd/m2
Luminance spread	27.53 cd/m2 (2 standard deviations)
Exposure value	–5.56 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.55 x 0.619
Camera settings	Exposure time: 1/25 ISO: 400 F-number: 5 Focal length: 39.6 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.