Digital camera sensitometry

Digital camera sensitometry

C014/2085 Rights Managed

Request low-res file

530 pixels on longest edge, unwatermarked

Request/Download high-res file

Uncompressed file size: 50.0MB

Downloadable file size: 2.4MB

Price image Pricing

Please login to use the price calculator


Credit: SHEILA TERRY/SCIENCE PHOTO LIBRARY

Caption: The imaging characteristics of a digital camera can be assessed by using the sensitometric methods developed for silver-based photographic systems. The DSLR camera has been set up to photograph a calibrated transmission step wedge consisting of a series of neutral densities ranging, on a logarithmic scale, from a minimum density of 0.08 to a maximum of 3.08 in 21 steps each increasing by 0.15. This represents a luminance range of 1000 to 1. A characteristic curve can be constructed by plotting the pixel values of the incremental steps obtained from imaging software against the relative luminance of the grey scale. From this the dynamic range, or useful exposure range, can be determined,. The speed or sensitivity of the camera can also be measured, as well as the effects of photo-imaging software manipulation. For digital scanners a reflection step wedge is used.

Release details: Model release not required. Property release not required.

Keywords: calibration, characteristic curve, densitometry, density, digital camera, dslr, dynamic range, grey scale, imaging software, logarithmic, luminance, neutral density, photographic, pixel, pixel values, reflection, scanner, sensitivity, sensitometry, silver-based, speed, step-wedge, transmission

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.