Contrast ratio of HP LP2475w

Black
Contrast ratio	1026:1 (edge: 618:1)
Monitor model	HP LP2475w
Submitted	26 Jan 2015 04:17 CET, by 74.193..
Camera model	Nikon D50
Processing remarks
Screen photo	[open image]
Luminance	0.13 cd/m2
Luminance spread	0.11 cd/m2 (2 standard deviations)
Exposure value	–3.51 stops (aim for –2 to –3)
Exposure spread	1.42 stops
Area used for calculation	0.722 x 0.814
Camera settings	Exposure time: 0.6 ISO: 400 F-number: 2 Focal length: 52 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	129 cd/m2
Luminance spread	32 cd/m2 (2 standard deviations)
Exposure value	–1.73 stops (aim for –2 to –3)
Exposure spread	0.36 stops
Area used for calculation	0.722 x 0.814
Camera settings	Exposure time: 1/500 ISO: 400 F-number: 2 Focal length: 52 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0.21 cd/m2
Luminance spread	0.19 cd/m2 (2 standard deviations)
Exposure value	–2.36 stops (aim for –2 to –3)
Exposure spread	1.38 stops
Area used for calculation	0.722 x 0.814
Camera settings	Exposure time: 0.8 ISO: 400 F-number: 2 Focal length: 52 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.