Contrast ratio of dell inspiron 9700

Black
Contrast ratio	146:1 (edge: 175:1)
Monitor model	dell inspiron 9700
Submitted	04 Apr 2010 08:04 CEST, by 24.203..
Camera model	Canon PowerShot A510
Processing remarks
Screen photo	[open image]
Luminance	1.42 cd/m2
Luminance spread	2.12 cd/m2 (2 standard deviations)
Exposure value	–1.7 stops (aim for –2 to –3)
Exposure spread	2.78 stops
Area used for calculation	0.5 x 0.5
Camera settings	Exposure time: 2.5 ISO: 50 F-number: 2.6 Focal length: 34.6 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	208 cd/m2
Luminance spread	119 cd/m2 (2 standard deviations)
Exposure value	–1.74 stops (aim for –2 to –3)
Exposure spread	0.85 stops
Area used for calculation	0.5 x 0.5
Camera settings	Exposure time: 1/60 ISO: 50 F-number: 2.6 Focal length: 34.6 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	1.19 cd/m2
Luminance spread	2.08 cd/m2 (2 standard deviations)
Exposure value	–1.96 stops (aim for –2 to –3)
Exposure spread	3.9 stops
Area used for calculation	0.5 x 0.5
Camera settings	Exposure time: 2.5 ISO: 50 F-number: 2.6 Focal length: 34.6 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.