| Contrast ratio | 139:1 |
|---|---|
| Monitor model | notebook samsung r428 |
| Submitted | 06 Jul 2013 15:48 CEST, by 117.65.*.* |
| Camera model | Canon EOS 400D DIGITAL |
| Processing remarks | Note: image file 1: suggested exposure time: 0.5 s (Set EV to -1.1) |
| Black | |
| Screen photo |
|
| Luminance | 1.26 cd/m2 |
| Luminance spread | 1.58 cd/m2 (2 standard deviations) |
| Exposure value | –1.44 stops (aim for –2 to –3) |
| Exposure spread | 2.13 stops |
| Area used for calculation | 0.39 x 0.439 |
| Camera settings | Exposure time: 1 ISO: 400 F-number: 4 Focal length: 28.1 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 175 cd/m2 |
| Luminance spread | 41 cd/m2 (2 standard deviations) |
| Exposure value | –2.28 stops (aim for –2 to –3) |
| Exposure spread | 0.34 stops |
| Area used for calculation | 0.39 x 0.439 |
| Camera settings | Exposure time: 1/250 ISO: 400 F-number: 4 Focal length: 28.1 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr026/06686a.jpg){kind=link}
![[open image]](upload/cr026/06686b.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.