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

Contrast ratio results

Contrast ratio 3:1
Monitor model
Submitted 16 Jun 2016 16:46 CEST, by 36.228.*.*
Camera model HTC One 801e
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 1: automatic white balance can cause inaccuracies.
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.
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 30 cd/m2
Luminance spread 91 cd/m2 (2 standard deviations)
Exposure value –2.1 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.528 x 0.7
Camera settings Exposure time: 1/120   ISO: 320   F-number: 2
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 98 cd/m2
Luminance spread 123 cd/m2 (2 standard deviations)
Exposure value –2.06 stops   (aim for –2 to –3)
Exposure spread 2.14 stops
Area used for calculation 0.528 x 0.7
Camera settings Exposure time: 1/149   ISO: 125   F-number: 2
Focal length: 0 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.