Contrast ratio results

Black
Contrast ratio	15:1
Monitor model
Submitted	23 Apr 2023 06:29 CEST, by 223.178..
Camera model	Canon PowerShot SX150 IS
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Note: image file 1: suggested exposure time: 0.7 s (Set EV to +1.4) Warning: image file 2: automatic white balance can cause inaccuracies. Warning: image file 2: Overexposed. Please decrease the shutter time. Note: image file 2: suggested exposure time: 1/23 s (Set EV to -2.5)
Screen photo	[open image]
Luminance	0.64 cd/m2
Luminance spread	1.01 cd/m2 (2 standard deviations)
Exposure value	–3.94 stops (aim for –2 to –3)
Exposure spread	3.05 stops
Area used for calculation	0.406 x 0.406
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 3.4 Focal length: 28.1 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	10 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–-0 stops (aim for –2 to –3)
Exposure spread	0 stops
Area used for calculation	0.406 x 0.406
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 3.4 Focal length: 28.1 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.