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Contrast ratio results for Acer g245H

Contrast ratio 404:1
Monitor model Acer g245H
Submitted 15 Mar 2011 12:55 CET, by 91.77.*.*
Camera model Nikon D90
Processing remarks

Note: image file 3: suggested exposure time: 1/150 s (Set EV to +1.4)
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
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 139 cd/m2
Luminance spread 273 cd/m2 (2 standard deviations)
Exposure value –3.95 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.375 x 0.423
Camera settings Exposure time: 1/400   ISO: 400   F-number: 5
Focal length: 27 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.