Image gamut mapping

A device for gamut mapping of an input image composed of pixels (P1, P2, P3) and having an input gamut (IG) defined by input RGB primaries (Ri, Gi, Bi) to a reproduction gamut (RG) defined by reproduction RGB primaries (Ro, Go, Bo), wherein the reproduction gamut (RG) is narrower than the input gamut (IG), the device comprises:

• a color transforming unit (1) for transforming an input signal (RGBin) defined with respect to the input RGB primaries (Ri, Gi, Bi) into a transformed signal (RGBt) defined with respect to the reproduction RGB primaries (Ro, Go, Bo), such that color information of the pixels (P1, P2, P3) within the reproduction gamut (RG) is preserved,
• a scaling factor unit (2) for determining scaling factors (SFi) indicating a distance between on the one hand pixels (P1, P2, P3) of the transformed signal (RGBt) which are outside the reproduction gamut (RG), and on the other hand an edge of the reproduction gamut (RG),
• a spatial low-pass filter (3) for filtering of the scaling factors (SFi) of pixels (P1, P2, P3) of the transformed signal (RGBt) to obtain filtered factors (FFi) for these pixels (P1, P2, P3), and
• a correction unit (4) for correcting component signal values of the transformed signal (RGBt) of the pixels (P1, P2, P3) in response to the filtered factors (FFi) to obtain reproduction signal values (RGBo) being input values (RGBi) moved towards inside the reproduction gamut (RG).