Contrast ratio results

Black
Contrast ratio	2:1
Monitor model
Submitted	22 Apr 2019 13:05 CEST, by 58.213..
Camera model	rockchip rk3288
Processing remarks	Warning: using the flash makes no sense. Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 1: automatic white balance can cause inaccuracies. image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: using the flash makes no sense. Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). 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: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 3: automatic white balance can cause inaccuracies. image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 3: Overexposed. Please decrease the shutter time. Note: image file 3: suggested exposure time: 1/88 s (Set EV to -2.1) 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	5 cd/m2
Luminance spread	7 cd/m2 (2 standard deviations)
Exposure value	–1.7 stops (aim for –2 to –3)
Exposure spread	2.39 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/20 ISO: 800 F-number: 2.8 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	8 cd/m2
Luminance spread	14 cd/m2 (2 standard deviations)
Exposure value	–2.44 stops (aim for –2 to –3)
Exposure spread	3.87 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/20 ISO: 300 F-number: 2.8 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	17 cd/m2
Luminance spread	13 cd/m2 (2 standard deviations)
Exposure value	–0.36 stops (aim for –2 to –3)
Exposure spread	1.13 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/20 ISO: 600 F-number: 2.8 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0

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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.