Contrast ratio of xg2401

Black
Contrast ratio	874:1 (edge: 741:1)
Monitor model	xg2401
Submitted	08 Nov 2019 15:00 CET, by 94.54..
Camera model	Canon PowerShot A590 IS
Processing remarks	Note: image file 1: suggested exposure time: 2.1 s (Set EV to +1.1)
Screen photo	[open image]
Luminance	0.12 cd/m2
Luminance spread	0.05 cd/m2 (2 standard deviations)
Exposure value	–3.58 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 ISO: 400 F-number: 2.6 Focal length: 34.3 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	106 cd/m2
Luminance spread	15 cd/m2 (2 standard deviations)
Exposure value	–2.78 stops (aim for –2 to –3)
Exposure spread	0.21 stops
Area used for calculation	0.495 x 0.495
Camera settings	Exposure time: 1/501 ISO: 400 F-number: 2.6 Focal length: 34.3 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0.14 cd/m2
Luminance spread	0.06 cd/m2 (2 standard deviations)
Exposure value	–3.34 stops (aim for –2 to –3)
Exposure spread	0.66 stops
Area used for calculation	0.495 x 0.495
Camera settings	Exposure time: 1 ISO: 400 F-number: 2.6 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.