Contrast ratio results

Black
Contrast ratio	148:1
Monitor model
Submitted	05 Nov 2023 08:37 CET, by 124.162..
Camera model	Canon EOS 550D
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 1: Overexposed. Please decrease the shutter time. Note: image file 1: suggested exposure time: 0.3 s (Set EV to -1.5) Warning: image file 2: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	1.33 cd/m2
Luminance spread	1.63 cd/m2 (2 standard deviations)
Exposure value	–0.98 stops (aim for –2 to –3)
Exposure spread	2.06 stops
Area used for calculation	0.393 x 0.442
Camera settings	Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 28.3 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	197 cd/m2
Luminance spread	119 cd/m2 (2 standard deviations)
Exposure value	–2.39 stops (aim for –2 to –3)
Exposure spread	0.89 stops
Area used for calculation	0.393 x 0.442
Camera settings	Exposure time: 1/395 ISO: 400 F-number: 3.5 Focal length: 28.3 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.