| Introduction | Testing lab | Noise & dynamic range | ISO sensitivity | Color sensitivity | MTF | Distortion, LCA, and vignetting | Light transmission |
Testing protocol for color sensitivity
Color sensitivity measurement requires knowing the RAW response of the sensor to a selection of known colors.
For this purpose, we shoot an image of a color target with perfectly known reflectance spectra using a controlled and spectrally-measured illuminant.
All color measurements are performed using a dedicated Kyoritsu color light box. This light box provides a uniform lighting over a surface about 50cm wide. The device enables to switch between several normalized illuminants (e.g., A, D65, CW, etc.).
The target is a Gretag Macbeth ColorChecker, which is composed of 18 uniform color patches and 6 gray level patches. For each illuminant, the reflection spectra of the patches are measured with a spectrometer, and then the RAW image values are measured.
The uniformity of the illuminance is below 7% (checked with a lux-meter).
Read more about Color measurement.