Contrast ratio results

Black
Contrast ratio	623:1
Monitor model
Submitted	08 Apr 2021 01:12 CEST, by 136.158..
Camera model	asus ASUSX00QD
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 1/4 s (Set EV to +3.4) Warning: image file 2: automatic white balance can cause inaccuracies. Note: image file 2: suggested exposure time: 1/170 s (Set EV to -1.4) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.3 cd/m2
Luminance spread	0.05 cd/m2 (2 standard deviations)
Exposure value	–5.75 stops (aim for –2 to –3)
Exposure spread	0.26 stops
Area used for calculation	0.498 x 0.25
Camera settings	Exposure time: 1/40 ISO: 684 F-number: 1.8 Focal length: 24 mm (35 mm equivalent) Exposure compensation: 0.167
White
Screen photo	[open image]
Luminance	187 cd/m2
Luminance spread	19 cd/m2 (2 standard deviations)
Exposure value	–0.98 stops (aim for –2 to –3)
Exposure spread	0.14 stops
Area used for calculation	0.348 x 0.345
Camera settings	Exposure time: 1/60 ISO: 45 F-number: 1.8 Focal length: 24 mm (35 mm equivalent) Exposure compensation: 0.167

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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.