| Contrast ratio | 3.18226e+06:1 |
|---|---|
| Monitor model | |
| Submitted | 13 Jan 2015 05:51 CET, by 110.175.*.* |
| Camera model | Canon PowerShot SX275 HS |
| Processing remarks | Warning: image file 1: Underexposed. Please increase the shutter time. |
| Black | |
| Screen photo |
|
| Luminance | 0 cd/m2 |
| Luminance spread | 0 cd/m2 (2 standard deviations) |
| Exposure value | –13.82 stops (aim for –2 to –3) |
| Exposure spread | 2.77 stops |
| Area used for calculation | 0.363 x 0.363 |
| Camera settings | Exposure time: 15 ISO: 80 F-number: 3.5 Focal length: 25.1 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 192 cd/m2 |
| Luminance spread | 12 cd/m2 (2 standard deviations) |
| Exposure value | –2.46 stops (aim for –2 to –3) |
| Exposure spread | 0.09 stops |
| Area used for calculation | 0.363 x 0.363 |
| Camera settings | Exposure time: 1/403 ISO: 400 F-number: 3.5 Focal length: 25.1 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr033/08458a.jpg){kind=link}
![[open image]](upload/cr033/08458b.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.