| Contrast ratio | 181:1 |
|---|---|
| Monitor model | Dell U2717D in room cloudy |
| Submitted | 31 May 2017 07:10 CEST, by 46.29.*.* |
| Camera model | Canon PowerShot SX260 HS |
| Processing remarks | Warning: Image F-number settings are not the same. |
| Black | |
| Screen photo |
|
| Luminance | 1.94 cd/m2 |
| Luminance spread | 1.29 cd/m2 (2 standard deviations) |
| Exposure value | –2.82 stops (aim for –2 to –3) |
| Exposure spread | 1 stops |
| Area used for calculation | 0.77 x 0.77 |
| Camera settings | Exposure time: 1/4 ISO: 400 F-number: 4 Focal length: 53.3 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 350 cd/m2 |
| Luminance spread | 25 cd/m2 (2 standard deviations) |
| Exposure value | –1.59 stops (aim for –2 to –3) |
| Exposure spread | 0.1 stops |
| Area used for calculation | 0.363 x 0.363 |
| Camera settings | Exposure time: 1/403 ISO: 400 F-number: 3.5 Focal length: 25.1 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr043/10830a.jpg){kind=link}
![[open image]](upload/cr043/10830b.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.