Contrast ratio | Test results | LCD test | Small-screen tests | Lagom home

Contrast ratio of Dell U2717D in room cloudy

Contrast ratio 258:1
Monitor model Dell U2717D in room cloudy
Submitted 31 May 2017 07:17 CEST, by 46.29.*.*
Camera model Canon PowerShot SX260 HS
Processing remarks


Black
Screen photo
[open image]
Luminance 1.4 cd/m2
Luminance spread 0.98 cd/m2 (2 standard deviations)
Exposure value –3.29 stops   (aim for –2 to –3)
Exposure spread 1.06 stops
Area used for calculation 0.584 x 0.584
Camera settings Exposure time: 1/4   ISO: 400   F-number: 4
Focal length: 40.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 360 cd/m2
Luminance spread 44 cd/m2 (2 standard deviations)
Exposure value –1.94 stops   (aim for –2 to –3)
Exposure spread 0.18 stops
Area used for calculation 0.584 x 0.584
Camera settings Exposure time: 1/403   ISO: 400   F-number: 4
Focal length: 40.4 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.