Contrast ratio results

Black
Contrast ratio	347:1
Monitor model
Submitted	12 Aug 2019 23:32 CEST, by 217.197..
Camera model	Canon PowerShot A720 IS
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 26.3 s (Set EV to +1.7) Note: image file 2: suggested exposure time: 1/13 s (Set EV to -1.1)
Screen photo	[open image]
Luminance	0.05 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–4.22 stops (aim for –2 to –3)
Exposure spread	0.47 stops
Area used for calculation	0.495 x 0.495
Camera settings	Exposure time: 8 ISO: 100 F-number: 2.8 Focal length: 34.3 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	16 cd/m2
Luminance spread	6 cd/m2 (2 standard deviations)
Exposure value	–1.36 stops (aim for –2 to –3)
Exposure spread	0.6 stops
Area used for calculation	0.495 x 0.495
Camera settings	Exposure time: 1/6 ISO: 100 F-number: 2.8 Focal length: 34.3 mm (35 mm equivalent) Exposure compensation: 0

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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.