Contrast ratio results

Black
Contrast ratio	1:1
Monitor model
Submitted	30 Apr 2014 13:15 CEST, by 95.153..
Camera model	Nikon D7000
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: Overexposed. Please decrease the shutter time. 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. Warning: using the flash makes no sense. 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: Overexposed. Please decrease the shutter time. 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	402 cd/m2
Luminance spread	810 cd/m2 (2 standard deviations)
Exposure value	–1.78 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.873 x 0.989
Camera settings	Exposure time: 1/80 ISO: 100 F-number: 4.5 Focal length: 63 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	402 cd/m2
Luminance spread	810 cd/m2 (2 standard deviations)
Exposure value	–1.78 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.873 x 0.989
Camera settings	Exposure time: 1/80 ISO: 100 F-number: 4.5 Focal length: 63 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	94 cd/m2
Luminance spread	281 cd/m2 (2 standard deviations)
Exposure value	–3.16 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.374 x 0.424
Camera settings	Exposure time: 1/160 ISO: 200 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: -1

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.