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Contrast ratio results for HP

Contrast ratio 644:1
Monitor model HP
Submitted 04 Feb 2018 08:50 CET, by 130.105.*.*
Camera model Canon DIGITAL IXUS 80 IS
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 10.7 s (Set EV to +5.4)

Black
Screen photo
[open image]
Luminance 0.06 cd/m2
Luminance spread 0.13 cd/m2 (2 standard deviations)
Exposure value –5.91 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.53 x 0.53
Camera settings Exposure time: 1   ISO: 200   F-number: 2.8
Focal length: 36.7 mm   (35 mm equivalent)
Exposure compensation: 2
White
Screen photo
[open image]
Luminance 36 cd/m2
Luminance spread 9 cd/m2 (2 standard deviations)
Exposure value –1.49 stops   (aim for –2 to –3)
Exposure spread 0.38 stops
Area used for calculation 0.53 x 0.53
Camera settings Exposure time: 1/30   ISO: 200   F-number: 2.8
Focal length: 36.7 mm   (35 mm equivalent)
Exposure compensation: 1

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.