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

Contrast ratio results for LG 27gp850

Contrast ratio 1479:1 (edge: 82534:1)
Monitor model LG 27gp850
Submitted 17 Aug 2023 09:23 CEST, by 109.245.*.*
Camera model samsung SM-G990B
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 0.7 s (Set EV to +8.0)
Warning: image file 2: Overexposed. Please decrease the shutter time.
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 166.8 s (Set EV to +7.4)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.16 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –10.53 stops   (aim for –2 to –3)
Exposure spread 0.55 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 1/350   ISO: 400   F-number: 1.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 242 cd/m2
Luminance spread 1 cd/m2 (2 standard deviations)
Exposure value –0 stops   (aim for –2 to –3)
Exposure spread 0 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 1/350   ISO: 400   F-number: 1.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –9.88 stops   (aim for –2 to –3)
Exposure spread 0.79 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 1   ISO: 100   F-number: 1.8
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.