Contrast ratio results

Black
Contrast ratio	2852:1
Monitor model
Submitted	05 Jun 2014 23:07 CEST, by 72.193..
Camera model	Canon EOS REBEL T2i
Processing remarks	image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. 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: Underexposed. Please increase the shutter time. Note: image file 2: suggested exposure time: 3.8 s (Set EV to +3.2)
Screen photo	[open image]
Luminance	0.12 cd/m2
Luminance spread	0.12 cd/m2 (2 standard deviations)
Exposure value	–5.73 stops (aim for –2 to –3)
Exposure spread	1.46 stops
Area used for calculation	0.393 x 0.442
Camera settings	Exposure time: 0.4 ISO: 400 F-number: 3.5 Focal length: 28.3 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	351 cd/m2
Luminance spread	70 cd/m2 (2 standard deviations)
Exposure value	–1.56 stops (aim for –2 to –3)
Exposure spread	0.29 stops
Area used for calculation	0.393 x 0.442
Camera settings	Exposure time: 1/395 ISO: 400 F-number: 3.5 Focal length: 28.3 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.