Contrast ratio results

Black
Contrast ratio	3684:1
Monitor model
Submitted	01 Jan 2018 01:36 CET, by 91.130..
Camera model	Panasonic DMC-GX7
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 8.2 s (Set EV to +9.7) image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 2: Overexposed. Please decrease the shutter time. Note: image file 2: suggested exposure time: 1/450 s (Set EV to -2.2)
Screen photo	[open image]
Luminance	0.04 cd/m2
Luminance spread	0.03 cd/m2 (2 standard deviations)
Exposure value	–12.18 stops (aim for –2 to –3)
Exposure spread	1.26 stops
Area used for calculation	0.626 x 0.514
Camera settings	Exposure time: 1/100 ISO: 400 F-number: 2.8 Focal length: 40 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	133 cd/m2
Luminance spread	9 cd/m2 (2 standard deviations)
Exposure value	–0.33 stops (aim for –2 to –3)
Exposure spread	0.1 stops
Area used for calculation	0.647 x 0.496
Camera settings	Exposure time: 1/100 ISO: 400 F-number: 2.8 Focal length: 40 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.