Contrast ratio results for HP Z24i

Black
Contrast ratio	946:1 (edge: 914:1)
Monitor model	HP Z24i
Submitted	26 May 2025 00:01 CEST, by 146.70..
Camera model	Canon PowerShot G7 X Mark II
Processing remarks	Warning: Image F-number settings are not the same.
Screen photo	[open image]
Luminance	0.18 cd/m2
Luminance spread	0.12 cd/m2 (2 standard deviations)
Exposure value	–1.86 stops (aim for –2 to –3)
Exposure spread	1 stops
Area used for calculation	0.335 x 0.377
Camera settings	Exposure time: 2 ISO: 400 F-number: 2.5 Focal length: 24.1 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	174 cd/m2
Luminance spread	18 cd/m2 (2 standard deviations)
Exposure value	–1.96 stops (aim for –2 to –3)
Exposure spread	0.15 stops
Area used for calculation	0.335 x 0.377
Camera settings	Exposure time: 1/403 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	0.19 cd/m2
Luminance spread	0.13 cd/m2 (2 standard deviations)
Exposure value	–1.81 stops (aim for –2 to –3)
Exposure spread	1.07 stops
Area used for calculation	0.335 x 0.377
Camera settings	Exposure time: 2 ISO: 400 F-number: 2.5 Focal length: 24.1 mm (35 mm equivalent) Exposure compensation: 0

{adcode}

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.