Method for calibrating a color space transformation, method for color space transformation and color control system

摘要

A method of calibrating a color space transformation accordingly comprises the driving of a light source at a first ambient temperature (T1). The light source is tuned to emit light with a number N of combinations of at least two correlated color temperatures and at least two intensities. Furthermore, for each of the N combinations, color coordinates are received by a processing unit including first red coordinates, first green coordinates and first blue coordinates derived from measurements in the RGB color space, and first x-coordinates, first y-coordinates and first z-coordinates derived from measurements in the XYZ color space. Respective 3xN matrices RGB_1 and XYZ_1 are subsequently constructed based on the received coordinates, and a 3x3 conversion matrix C is generated to fulfil the relation XYZ_1 = C*RGB_1.