Patent ID: 8379971

Claim:
A method of gamut mapping of an input image composed of pixels and having an input gamut (IG) defined by input RGB primaries (R i , G i , B i ) to a reproduction gamut (RG) defined by reproduction RGB primaries (R 0 , G 0 , B 0 ), wherein the reproduction gamut (RG) is narrower than the input gamut (IG), the method comprises: color transforming an input signal (RGB in ,) defined with respect to the input RGB primaries (R i , G i , B i ) into a transformed signal (RGB t ) defined with respect to the reproduction RGB primaries (R 0 , G 0 , B 0 ), whereby color information of the pixels (P 1 , P 2 , P 3 ) within the reproduction gamut (RG) is preserved, determining scaling factors (SF i ) indicating a distance between on the one hand pixels (P 1 , P 2 , P 3 ) of the transformed signal (RGB t ) which are outside the reproduction gamut (RG), and on the other hand an edge of the reproduction gamut (RG), spatial low-pass filtering of the scaling factors (SF i ) of pixels (P 1 , P 2 , P 3 ) of the transformed signal (RGB t ) to obtain filtered factors (FF i ) for these pixels (PI, P 2 , P 3 ), and correcting component signal values of the transformed signal (RGB t ) in response to the filtered factors (FF i ) to obtain reproduction signal values (RGB 0 ) being input values (RGB in ) moved towards inside the reproduction gamut (RG).