Contrast ratio results for GTC

Black
Contrast ratio	6:1
Monitor model	GTC
Submitted	02 Jun 2011 20:11 CEST, by 222.124..
Camera model	Nikon D7000
Processing remarks	Warning: image file 1: camera was zoomed in too much. 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 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. 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 3: camera was zoomed in too much. Warning: image file 3: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. 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 file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	264 cd/m2
Luminance spread	494 cd/m2 (2 standard deviations)
Exposure value	–2.37 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/640 ISO: 160 F-number: 2 Focal length: 75 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	1636 cd/m2
Luminance spread	1613 cd/m2 (2 standard deviations)
Exposure value	–1.74 stops (aim for –2 to –3)
Exposure spread	1.56 stops
Area used for calculation	1 x 0.497
Camera settings	Exposure time: 1/125 ISO: 125 F-number: 8 Focal length: 75 mm (35 mm equivalent) Exposure compensation: 5
Black at screen edge
Screen photo	[open image]
Luminance	375 cd/m2
Luminance spread	427 cd/m2 (2 standard deviations)
Exposure value	–1.87 stops (aim for –2 to –3)
Exposure spread	1.87 stops
Area used for calculation	1 x 0.497
Camera settings	Exposure time: 1/640 ISO: 160 F-number: 2 Focal length: 75 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.