| Contrast ratio | 18862:1 |
|---|---|
| Monitor model | HP 24f |
| Submitted | 03 Jan 2019 17:54 CET, by 95.91.*.* |
| Camera model | Xiaomi Redmi Note 5 |
| Processing remarks | Warning: image file 1: Underexposed. Please increase the shutter time. |
| Black | |
| Screen photo |
|
| Luminance | 0.01 cd/m2 |
| Luminance spread | 0.01 cd/m2 (2 standard deviations) |
| Exposure value | –10.51 stops (aim for –2 to –3) |
| Exposure spread | 4.25 stops |
| Area used for calculation | 0.323 x 0.404 |
| Camera settings | Exposure time: 1/13 ISO: 400 F-number: 1.9 Focal length: 24 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 130 cd/m2 |
| Luminance spread | 16 cd/m2 (2 standard deviations) |
| Exposure value | –1.2 stops (aim for –2 to –3) |
| Exposure spread | 0.18 stops |
| Area used for calculation | 0.323 x 0.404 |
| Camera settings | Exposure time: 1/387 ISO: 400 F-number: 1.9 Focal length: 24 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr051/12782a.jpg){kind=link}
![[open image]](upload/cr051/12782b.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.