| Contrast ratio | 603:1 |
|---|---|
| Monitor model | w1942s |
| Submitted | 06 Dec 2013 18:33 CET, by 130.25.*.* |
| Camera model | Canon PowerShot A470 |
| Processing remarks |
|
| Black | |
| Screen photo |
|
| Luminance | 0.28 cd/m2 |
| Luminance spread | 0.12 cd/m2 (2 standard deviations) |
| Exposure value | –2.1 stops (aim for –2 to –3) |
| Exposure spread | 0.6 stops |
| Area used for calculation | 0.542 x 0.542 |
| Camera settings | Exposure time: 1 ISO: 640 F-number: 3 Focal length: 37.5 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 169 cd/m2 |
| Luminance spread | 46 cd/m2 (2 standard deviations) |
| Exposure value | –1.52 stops (aim for –2 to –3) |
| Exposure spread | 0.4 stops |
| Area used for calculation | 0.542 x 0.542 |
| Camera settings | Exposure time: 1/403 ISO: 640 F-number: 3 Focal length: 37.5 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr028/07083a.jpg){kind=link}
![[open image]](upload/cr028/07083b.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.