Contrast ratio results for Laptop HP dv7-3183cl

Black
Contrast ratio	16:1
Monitor model	Laptop HP dv7-3183cl
Submitted	03 Jul 2011 04:55 CEST, by 189.79..
Camera model	Nikon D60
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 5.2 s (Set EV to +3.1) Warning: image file 2: Underexposed. Please increase the shutter time. Note: image file 2: suggested exposure time: 0.3 s (Set EV to +7.0)
Screen photo	[open image]
Luminance	0.35 cd/m2
Luminance spread	0.24 cd/m2 (2 standard deviations)
Exposure value	–5.62 stops (aim for –2 to –3)
Exposure spread	1.02 stops
Area used for calculation	0.584 x 0.654
Camera settings	Exposure time: 0.6 ISO: 100 F-number: 3.5 Focal length: 42 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	6 cd/m2
Luminance spread	3 cd/m2 (2 standard deviations)
Exposure value	–9.52 stops (aim for –2 to –3)
Exposure spread	0.75 stops
Area used for calculation	0.584 x 0.654
Camera settings	Exposure time: 1/400 ISO: 100 F-number: 3.5 Focal length: 42 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.