Contrast ratio of LG 27GP850

Black
Contrast ratio	845:1 (edge: 939:1)
Monitor model	LG 27GP850
Submitted	30 Jan 2022 00:56 CET, by 178.19..
Camera model	samsung SM-N975F
Processing remarks
Screen photo	[open image]
Luminance	0.3 cd/m2
Luminance spread	0.05 cd/m2 (2 standard deviations)
Exposure value	–2.04 stops (aim for –2 to –3)
Exposure spread	0.23 stops
Area used for calculation	0.425 x 0.319
Camera settings	Exposure time: 1 ISO: 400 F-number: 2.4 Focal length: 26 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	253 cd/m2
Luminance spread	7 cd/m2 (2 standard deviations)
Exposure value	–0.77 stops (aim for –2 to –3)
Exposure spread	0.04 stops
Area used for calculation	0.425 x 0.319
Camera settings	Exposure time: 1/350 ISO: 400 F-number: 2.4 Focal length: 26 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0.27 cd/m2
Luminance spread	0.04 cd/m2 (2 standard deviations)
Exposure value	–2.19 stops (aim for –2 to –3)
Exposure spread	0.21 stops
Area used for calculation	0.425 x 0.319
Camera settings	Exposure time: 1 ISO: 400 F-number: 2.4 Focal length: 26 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.