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

Contrast ratio results

Contrast ratio 23:1
Monitor model
Submitted 03 Mar 2022 12:42 CET, by 210.178.*.*
Camera model samsung SM-F700N
Processing remarks

image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 1: Overexposed. Please decrease the shutter time.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/170 s (Set EV to -2.1)

Black
Screen photo
[open image]
Luminance 0.87 cd/m2
Luminance spread 3.68 cd/m2 (2 standard deviations)
Exposure value –3.25 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.347 x 0.452
Camera settings Exposure time: 1/12   ISO: 400   F-number: 1.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 20 cd/m2
Luminance spread 23 cd/m2 (2 standard deviations)
Exposure value –0.45 stops   (aim for –2 to –3)
Exposure spread 1.81 stops
Area used for calculation 0.346 x 0.454
Camera settings Exposure time: 1/40   ISO: 400   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.