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Contrast ratio of HP Z24i

Contrast ratio 1225:1 (edge: 1296:1)
Monitor model HP Z24i
Submitted 25 May 2025 23:56 CEST, by 146.70.*.*
Camera model Canon PowerShot G7 X Mark II
Processing remarks

Note: image file 1: suggested exposure time: 2.0 s (Set EV to +1.0)
Note: image file 3: suggested exposure time: 2.1 s (Set EV to +1.1)

Black
Screen photo
[open image]
Luminance 0.15 cd/m2
Luminance spread 0.14 cd/m2 (2 standard deviations)
Exposure value –3.51 stops   (aim for –2 to –3)
Exposure spread 1.46 stops
Area used for calculation 0.335 x 0.377
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 24.1 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 180 cd/m2
Luminance spread 18 cd/m2 (2 standard deviations)
Exposure value –2.22 stops   (aim for –2 to –3)
Exposure spread 0.14 stops
Area used for calculation 0.335 x 0.377
Camera settings Exposure time: 1/501   ISO: 400   F-number: 2.8
Focal length: 24.1 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.14 cd/m2
Luminance spread 0.15 cd/m2 (2 standard deviations)
Exposure value –3.59 stops   (aim for –2 to –3)
Exposure spread 1.75 stops
Area used for calculation 0.335 x 0.377
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 24.1 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.