Contrast ratio results

Black
Contrast ratio	13:1
Monitor model
Submitted	15 Apr 2021 19:48 CEST, by 5.95..
Camera model	Panasonic DC-FZ82
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 1/32 s (Set EV to +3.0) Warning: image file 2: automatic white balance can cause inaccuracies. image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 3: automatic white balance can cause inaccuracies. image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: Image ISO settings are not the same. Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	2.29 cd/m2
Luminance spread	14.72 cd/m2 (2 standard deviations)
Exposure value	–5.47 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.769 x 1
Camera settings	Exposure time: 1/250 ISO: 3200 F-number: 3.9 Focal length: 58 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	29 cd/m2
Luminance spread	24 cd/m2 (2 standard deviations)
Exposure value	–2.5 stops (aim for –2 to –3)
Exposure spread	1.31 stops
Area used for calculation	0.769 x 1
Camera settings	Exposure time: 1/250 ISO: 2000 F-number: 3.9 Focal length: 58 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	17 cd/m2
Luminance spread	37 cd/m2 (2 standard deviations)
Exposure value	–2.59 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.769 x 1
Camera settings	Exposure time: 1/250 ISO: 3200 F-number: 3.9 Focal length: 58 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.