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

Contrast ratio results

Contrast ratio 121:1
Monitor model
Submitted 13 Feb 2013 02:49 CET, by 190.176.*.*
Camera model Canon EOS REBEL T1i
Processing remarks

image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 3: Overexposed. Please decrease the shutter time.
Note: image file 3: suggested exposure time: 1/61 s (Set EV to -1.3)
Warning: Image focal lengths/zoom levels are not the same.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 0.99 cd/m2
Luminance spread 1.5 cd/m2 (2 standard deviations)
Exposure value –2.51 stops   (aim for –2 to –3)
Exposure spread 2.84 stops
Area used for calculation 0.75 x 0.844
Camera settings Exposure time: 0.8   ISO: 400   F-number: 4.6
Focal length: 54 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 121 cd/m2
Luminance spread 85 cd/m2 (2 standard deviations)
Exposure value –2.89 stops   (aim for –2 to –3)
Exposure spread 1.06 stops
Area used for calculation 0.75 x 0.844
Camera settings Exposure time: 1/197   ISO: 400   F-number: 4.6
Focal length: 54 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 49 cd/m2
Luminance spread 93 cd/m2 (2 standard deviations)
Exposure value –1.21 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.397 x 0.447
Camera settings Exposure time: 1/25   ISO: 400   F-number: 4.6
Focal length: 28.6 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.