Contrast ratio results for Acer g245H

Black
Contrast ratio	404:1
Monitor model	Acer g245H
Submitted	15 Mar 2011 12:57 CET, by 91.77..
Camera model	Nikon D90
Processing remarks	Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	0.68 cd/m2
Luminance spread	0.45 cd/m2 (2 standard deviations)
Exposure value	–2.98 stops (aim for –2 to –3)
Exposure spread	1.01 stops
Area used for calculation	0.375 x 0.423
Camera settings	Exposure time: 1 ISO: 400 F-number: 5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: -1
White
Screen photo	[open image]
Luminance	273 cd/m2
Luminance spread	56 cd/m2 (2 standard deviations)
Exposure value	–2.97 stops (aim for –2 to –3)
Exposure spread	0.3 stops
Area used for calculation	0.375 x 0.423
Camera settings	Exposure time: 1/400 ISO: 400 F-number: 5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	110 cd/m2
Luminance spread	229 cd/m2 (2 standard deviations)
Exposure value	–2.96 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.375 x 0.423
Camera settings	Exposure time: 1/160 ISO: 400 F-number: 5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 4

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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.