Contrast ratio results

Black
Contrast ratio	14513:1
Monitor model
Submitted	03 Dec 2016 21:35 CET, by 62.78..
Camera model	Sony SLT-A37
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. 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: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 299.8 s (Set EV to +5.6) Warning: image file 2: automatic white balance can cause inaccuracies. image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 3: automatic white balance can cause inaccuracies. image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–8.14 stops (aim for –2 to –3)
Exposure spread	0.81 stops
Area used for calculation	0.375 x 0.423
Camera settings	Exposure time: 6 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	22 cd/m2
Luminance spread	11 cd/m2 (2 standard deviations)
Exposure value	–2.81 stops (aim for –2 to –3)
Exposure spread	0.75 stops
Area used for calculation	0.375 x 0.423
Camera settings	Exposure time: 1/60 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	13 cd/m2
Luminance spread	28 cd/m2 (2 standard deviations)
Exposure value	–2.35 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.375 x 0.423
Camera settings	Exposure time: 1/25 ISO: 400 F-number: 3.5 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.