Contrast ratio results for Dell Inspiron 1440

Black
Contrast ratio	135:1
Monitor model	Dell Inspiron 1440
Submitted	01 Jun 2017 10:19 CEST, by 36.72..
Camera model	Canon EOS 600D
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: 1/8 s (Set EV to -0.5) Warning: image file 2: camera was zoomed in too much. Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. Warning: image file 2: Underexposed. Please increase the shutter time.
Screen photo	[open image]
Luminance	1.05 cd/m2
Luminance spread	1.98 cd/m2 (2 standard deviations)
Exposure value	–4.05 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/25 ISO: 400 F-number: 1.8 Focal length: 78.6 mm (35 mm equivalent) Exposure compensation: -2
White
Screen photo	[open image]
Luminance	141 cd/m2
Luminance spread	90 cd/m2 (2 standard deviations)
Exposure value	–4.33 stops (aim for –2 to –3)
Exposure spread	0.96 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/4096 ISO: 400 F-number: 1.8 Focal length: 78.6 mm (35 mm equivalent) Exposure compensation: -2

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.