| Contrast ratio | 63:1 |
|---|---|
| Monitor model | LG R480 laptop |
| Submitted | 22 Aug 2010 17:12 CEST, by 189.110.*.* |
| Camera model | Hewlett-Packard HP DSC CB350 |
| Processing remarks | Warning: image file 2: Underexposed. Please increase the shutter time. |
| Black | |
| Screen photo |
|
| Luminance | 0.37 cd/m2 |
| Luminance spread | 0.8 cd/m2 (2 standard deviations) |
| Exposure value | –3.4 stops (aim for –2 to –3) |
| Exposure spread | 4.25 stops |
| Area used for calculation | 0.549 x 0.549 |
| Camera settings | Exposure time: 1 ISO: 200 F-number: 3 Focal length: 38 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 23 cd/m2 |
| Luminance spread | 7 cd/m2 (2 standard deviations) |
| Exposure value | –6.06 stops (aim for –2 to –3) |
| Exposure spread | 0.45 stops |
| Area used for calculation | 0.549 x 0.549 |
| Camera settings | Exposure time: 1/400 ISO: 200 F-number: 3 Focal length: 38 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr012/03120a.jpg){kind=link}
![[open image]](upload/cr012/03120b.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.