| Contrast ratio | 1229:1 |
|---|---|
| Monitor model | Dell 2407WFP-HC |
| Submitted | 09 Dec 2011 21:40 CET, by 85.121.*.* |
| Camera model | Canon PowerShot SX230 HS |
| Processing remarks | Warning: image file 1: Underexposed. Please increase the shutter time. |
| Black | |
| Screen photo |
|
| Luminance | 0.24 cd/m2 |
| Luminance spread | 0.17 cd/m2 (2 standard deviations) |
| Exposure value | –4.09 stops (aim for –2 to –3) |
| Exposure spread | 1.04 stops |
| Area used for calculation | 0.403 x 0.403 |
| Camera settings | Exposure time: 1/4 ISO: 800 F-number: 3.1 Focal length: 27.9 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 296 cd/m2 |
| Luminance spread | 21 cd/m2 (2 standard deviations) |
| Exposure value | –0.48 stops (aim for –2 to –3) |
| Exposure spread | 0.1 stops |
| Area used for calculation | 0.403 x 0.403 |
| Camera settings | Exposure time: 1/403 ISO: 800 F-number: 3.1 Focal length: 27.9 mm (35 mm equivalent) Exposure compensation: 1 |
![[open image]](upload/cr018/04723a.jpg){kind=link}
![[open image]](upload/cr018/04723b.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.