Contrast ratio of HP Z27n

Black
Contrast ratio	1007:1 (edge: 590:1)
Monitor model	HP Z27n
Submitted	30 May 2017 22:10 CEST, by 46.29..
Camera model	Canon PowerShot SX260 HS
Processing remarks
Screen photo	[open image]
Luminance	0.33 cd/m2
Luminance spread	0.25 cd/m2 (2 standard deviations)
Exposure value	–3 stops (aim for –2 to –3)
Exposure spread	1.14 stops
Area used for calculation	0.363 x 0.363
Camera settings	Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 25.1 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	330 cd/m2
Luminance spread	24 cd/m2 (2 standard deviations)
Exposure value	–1.68 stops (aim for –2 to –3)
Exposure spread	0.11 stops
Area used for calculation	0.363 x 0.363
Camera settings	Exposure time: 1/403 ISO: 400 F-number: 3.5 Focal length: 25.1 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0.56 cd/m2
Luminance spread	0.49 cd/m2 (2 standard deviations)
Exposure value	–2.23 stops (aim for –2 to –3)
Exposure spread	1.35 stops
Area used for calculation	0.363 x 0.363
Camera settings	Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 25.1 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.