| Contrast ratio | 5122:1 |
|---|---|
| Monitor model | NEC 20WGX2 |
| Submitted | 13 Apr 2009 08:56 CEST, by 217.114.*.* |
| Camera model | Canon PowerShot A570 IS |
| Processing remarks | Warning: image file 1: Underexposed. Please increase the shutter time. |
| Black | |
| Screen photo |
|
| Luminance | 0.03 cd/m2 |
| Luminance spread | 0.02 cd/m2 (2 standard deviations) |
| Exposure value | –9.78 stops (aim for –2 to –3) |
| Exposure spread | 0.86 stops |
| Area used for calculation | 0.495 x 0.495 |
| Camera settings | Exposure time: 1/4 ISO: 80 F-number: 2.6 Focal length: 34.3 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 169 cd/m2 |
| Luminance spread | 14 cd/m2 (2 standard deviations) |
| Exposure value | –2.11 stops (aim for –2 to –3) |
| Exposure spread | 0.12 stops |
| Area used for calculation | 0.495 x 0.495 |
| Camera settings | Exposure time: 1/101 ISO: 80 F-number: 2.6 Focal length: 34.3 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr005/01426a.jpg){kind=link}
![[open image]](upload/cr005/01426b.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.