| Contrast ratio | 650:1 |
|---|---|
| Monitor model | Dell 2209wa |
| Submitted | 31 Mar 2009 04:03 CEST, by 190.50.*.* |
| Camera model | Panasonic DMC-LZ7 |
| Processing remarks | Warning: image file 1: automatic white balance can cause inaccuracies. |
| Black | |
| Screen photo |
|
| Luminance | 0.12 cd/m2 |
| Luminance spread | 0.04 cd/m2 (2 standard deviations) |
| Exposure value | –2.86 stops (aim for –2 to –3) |
| Exposure spread | 0.5 stops |
| Area used for calculation | 0.534 x 0.534 |
| Camera settings | Exposure time: 8 ISO: 100 F-number: 2.8 Focal length: 37 mm (35 mm equivalent) Exposure compensation: 1 |
| White | |
| Screen photo |
|
| Luminance | 75 cd/m2 |
| Luminance spread | 6 cd/m2 (2 standard deviations) |
| Exposure value | –3.16 stops (aim for –2 to –3) |
| Exposure spread | 0.12 stops |
| Area used for calculation | 0.534 x 0.534 |
| Camera settings | Exposure time: 1/100 ISO: 100 F-number: 2.8 Focal length: 37 mm (35 mm equivalent) Exposure compensation: -1 |
![[open image]](upload/cr005/01397a.jpg){kind=link}
![[open image]](upload/cr005/01397b.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.