| Contrast ratio | 1339:1 |
|---|---|
| Monitor model | HP Z24i LG LM240WU8 |
| Submitted | 08 Jul 2014 21:38 CEST, by 176.98.*.* |
| Camera model | Canon PowerShot SX200 IS |
| Processing remarks | Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. |
| Black | |
| Screen photo |
|
| Luminance | 0.2 cd/m2 |
| Luminance spread | 0.1 cd/m2 (2 standard deviations) |
| Exposure value | –2.64 stops (aim for –2 to –3) |
| Exposure spread | 0.74 stops |
| Area used for calculation | 0.394 x 0.394 |
| Camera settings | Exposure time: 2 ISO: 400 F-number: 3.4 Focal length: 27.3 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 266 cd/m2 |
| Luminance spread | 27 cd/m2 (2 standard deviations) |
| Exposure value | –2.56 stops (aim for –2 to –3) |
| Exposure spread | 0.15 stops |
| Area used for calculation | 0.394 x 0.394 |
| Camera settings | Exposure time: 1/636 ISO: 400 F-number: 3.4 Focal length: 27.3 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr031/07919a.jpg){kind=link}
![[open image]](upload/cr031/07919b.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.