| Contrast ratio | 1:1 |
|---|---|
| Monitor model | |
| Submitted | 22 Sep 2011 08:19 CEST, by 75.130.*.* |
| Camera model | Canon PowerShot A570 IS |
| Processing remarks |
|
| Black | |
| Screen photo |
|
| Luminance | 113 cd/m2 |
| Luminance spread | 9 cd/m2 (2 standard deviations) |
| Exposure value | –2.36 stops (aim for –2 to –3) |
| Exposure spread | 0.11 stops |
| Area used for calculation | 0.507 x 0.507 |
| Camera settings | Exposure time: 1/403 ISO: 400 F-number: 2.6 Focal length: 35.1 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 132 cd/m2 |
| Luminance spread | 22 cd/m2 (2 standard deviations) |
| Exposure value | –2.15 stops (aim for –2 to –3) |
| Exposure spread | 0.24 stops |
| Area used for calculation | 0.507 x 0.507 |
| Camera settings | Exposure time: 1/403 ISO: 400 F-number: 2.6 Focal length: 35.1 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr017/04446a.jpg){kind=link}
![[open image]](upload/cr017/04446b.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.