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Contrast ratio results for Dell XPS 15 9550 (4K IGZO)

Contrast ratio 3285:1
Monitor model Dell XPS 15 9550 (4K IGZO)
Submitted 19 Jan 2017 21:01 CET, by 172.73.*.*
Camera model Canon EOS REBEL T5i
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 4.3 s (Set EV to +4.1)

Black
Screen photo
[open image]
Luminance 0.11 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –6.62 stops   (aim for –2 to –3)
Exposure spread 0.68 stops
Area used for calculation 0.396 x 0.445
Camera settings Exposure time: 1/4   ISO: 400   F-number: 3.5
Focal length: 28.5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 351 cd/m2
Luminance spread 92 cd/m2 (2 standard deviations)
Exposure value –1.56 stops   (aim for –2 to –3)
Exposure spread 0.38 stops
Area used for calculation 0.396 x 0.445
Camera settings Exposure time: 1/395   ISO: 400   F-number: 3.5
Focal length: 28.5 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.