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Contrast ratio results for hp envy 24

Contrast ratio 18551:1
Monitor model hp envy 24
Submitted 01 Mar 2019 10:09 CET, by 105.112.*.*
Camera model Canon EOS 200D
Processing remarks

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: 26.5 s (Set EV to +13.7)
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.

Black
Screen photo
[open image]
Luminance 0.01 cd/m2
Luminance spread 1.35 cd/m2 (2 standard deviations)
Exposure value –16.23 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.367 x 0.412
Camera settings Exposure time: 1/512   ISO: 400   F-number: 2.8
Focal length: 26.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 208 cd/m2
Luminance spread 25 cd/m2 (2 standard deviations)
Exposure value –2.05 stops   (aim for –2 to –3)
Exposure spread 0.18 stops
Area used for calculation 0.367 x 0.412
Camera settings Exposure time: 1/512   ISO: 400   F-number: 2.8
Focal length: 26.4 mm   (35 mm equivalent)
Exposure compensation: 0

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.