Contrast ratio results for HP 27FW

Black
Contrast ratio	3290:1
Monitor model	HP 27FW
Submitted	22 Oct 2022 14:19 CEST, by 93.47..
Camera model	Canon EOS 250D
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 5.7 s (Set EV to +4.5) Warning: image file 2: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	0.11 cd/m2
Luminance spread	0.15 cd/m2 (2 standard deviations)
Exposure value	–7.01 stops (aim for –2 to –3)
Exposure spread	2.51 stops
Area used for calculation	0.403 x 0.453
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 4 Focal length: 29 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	350 cd/m2
Luminance spread	53 cd/m2 (2 standard deviations)
Exposure value	–1.95 stops (aim for –2 to –3)
Exposure spread	0.22 stops
Area used for calculation	0.403 x 0.453
Camera settings	Exposure time: 1/395 ISO: 400 F-number: 4 Focal length: 29 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.