Contrast ratio results

Black
Contrast ratio	48485:1
Monitor model
Submitted	16 Sep 2025 10:26 CEST, by 76.170..
Camera model	Canon EOS REBEL T4i
Processing remarks	Warning: image file 1: camera was zoomed in too much. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 745.2 s (Set EV to +13.1) Warning: image file 2: camera was zoomed in too much. Warning: image file 2: Overexposed. Please decrease the shutter time. Note: image file 2: suggested exposure time: 1/65 s (Set EV to -2.4)
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–15.63 stops (aim for –2 to –3)
Exposure spread	1.54 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/12 ISO: 400 F-number: 5.7 Focal length: 214 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	80 cd/m2
Luminance spread	4 cd/m2 (2 standard deviations)
Exposure value	–0.06 stops (aim for –2 to –3)
Exposure spread	0.07 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/12 ISO: 400 F-number: 5.7 Focal length: 214 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.