Spectral Sensitivity Function

Conceptual illustration of controlled spectra, a test chart and different camera sensors. This is not a photograph of a THOUSLITE product or the apparatus used in the cited study. The same test chart, the same laboratory and apparently the same white light can still produce different color results when a camera sensor is replaced. For businesses seeking consistent imaging across camera models, production lines and suppliers, accurate white balance alone may not resolve the problem. Differences can begin as soon as light reaches the sensor. A study published online in Color Research & Application on 19 October 2026 explores cross-sensor color constancy. The researchers introduce physical image-formation constraints into model training to improve illuminant estimation for unfamiliar cameras without explicitly characterizing every target sensor. The work does not make hardware calibration redundant. It instead brings a fundamental question into focus: if the optical conditions in an imaging system cannot be described, what is the algorithm actually learning? Color Differences Begin Where Light Meets the Sensor An object surface does not have a fixed RGB value that a camera can read independently of illumination. The signal recorded in each color channel depends on the interaction between the illuminant’s spectral power distribution…