Contrast ratio results

Black
Contrast ratio	1518:1
Monitor model
Submitted	07 Jan 2022 15:54 CET, by 92.97..
Camera model	Canon EOS 200D
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 1.0 s (Set EV to +8.6) Warning: image file 2: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	0.03 cd/m2
Luminance spread	0.02 cd/m2 (2 standard deviations)
Exposure value	–11.08 stops (aim for –2 to –3)
Exposure spread	1.01 stops
Area used for calculation	0.389 x 0.437
Camera settings	Exposure time: 1/395 ISO: 6400 F-number: 3.5 Focal length: 28 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	45 cd/m2
Luminance spread	5 cd/m2 (2 standard deviations)
Exposure value	–0.52 stops (aim for –2 to –3)
Exposure spread	0.16 stops
Area used for calculation	0.389 x 0.437
Camera settings	Exposure time: 1/395 ISO: 6400 F-number: 3.5 Focal length: 28 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.