| Contrast ratio | 2171:1 |
|---|---|
| Monitor model | DELL U2417H |
| Submitted | 02 Oct 2017 19:03 CEST, by 86.101.*.* |
| Camera model | Canon EOS 400D DIGITAL |
| Processing remarks | Warning: image file 1: Underexposed. Please increase the shutter time. |
| Black | |
| Screen photo |
|
| Luminance | 0.07 cd/m2 |
| Luminance spread | 0.01 cd/m2 (2 standard deviations) |
| Exposure value | –4.58 stops (aim for –2 to –3) |
| Exposure spread | 0.17 stops |
| Area used for calculation | 0.541 x 0.617 |
| Camera settings | Exposure time: 4 ISO: 200 F-number: 4 Focal length: 39.1 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 155 cd/m2 |
| Luminance spread | 9 cd/m2 (2 standard deviations) |
| Exposure value | –2.46 stops (aim for –2 to –3) |
| Exposure spread | 0.09 stops |
| Area used for calculation | 0.548 x 0.598 |
| Camera settings | Exposure time: 1/125 ISO: 200 F-number: 4 Focal length: 39.1 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr044/11121a.jpg){kind=link}
![[open image]](upload/cr044/11121b.jpg){kind=link}
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.