Method of determination of a chroma mapping function allowing to map at least the chroma C of source colors of a content from a source color gamut into a target color gamut in a 3D gamut mapping color space allowing to define 2D constant-hue leaves having axes for lightness and chroma, comprising: - determining in said gamut mapping color space a plurality of key constant-hue leaves, wherein a key constant-hue leaf is defined by a key hue h* corresponding to the hue of one of the primary and secondary colors defining said source color gamut, or/and to the hue of one of the primary and secondary colors defining said target color gamut, such as to partition said gamut mapping color space into a plurality of angular hue sectors, wherein an angular hue sector is delimited in hue direction by two different key constant-hue leaves, - for said key constant-hue leaf of hue h*, determining a key hue leaf chroma mapping function g h ∗ allowing to map the chroma of any of said source colors belonging to said key constant-hue leaf, such that, when applied to the chroma C of a source color of lightness L that belongs to the corresponding key constant-hue leaf of hue h*, said chroma C is mapped into a chroma C ′ = C max − h * TARGET ⋅ g h * C C max − h * SOURCE, where, in said key constant-hue leaf of hue h*: - C max − h * SOURCE is the chroma of a color at the intersection of a line of constant lightness L with said source color gamut, - C max − h * TRARGET is the chroma of a color at the intersection of said line of constant lightness L with said target color gamut, and where said key constant-hue leaf chroma mapping function g h ∗ is defined as homogeneously growing in the interval [0,1], non-linear, and independent from said lightness L, - for an angular hue sector, determining a continuous angular hue sector chroma mapping function g allowing to map the chroma of any of said source colors belonging to this angular hue sector, such that when applied to the chroma C of a source color of lightness L and hue h that belongs to said angular hue sector, said chroma C is mapped into a chroma C ′′ = C max − h TARGET ⋅ g h C C max − h SOURCE, where, in the constant hue leaf of hue h: - C max − h SOURCE is the chroma of a color at the intersection of a line of constant lightness L with said source color gamut, - C max − h TRARGET is the chroma of a color at the intersection of said line of constant lightness L with said target color gamut, and wherein said continuous angular hue sector chroma mapping function g is such that, for a source color belonging to one of the two key constant-hue leaves of hue h* 0 and hue h* 1 delimiting said angular hue sector, said continuous chroma mapping function allows to map the chroma of said source color according to the key hue leaf chroma mapping function g h * 0 or g h * 1 of the key constant-hue leaf to which said source color belongs. - determining in said gamut mapping color space a plurality of key constant-hue leaves, wherein a key constant-hue leaf is defined by a key hue h* corresponding to the hue of one of the primary and secondary colors defining said source color gamut, or/and to the hue of one of the primary and secondary colors defining said target color gamut, such as to partition said gamut mapping color space into a plurality of angular hue sectors, wherein an angular hue sector is delimited in hue direction by two different key constant-hue leaves, - for said key constant-hue leaf of hue h*, determining a key hue leaf chroma mapping function g h ∗ allowing to map the chroma of any of said source colors belonging to said key constant-hue leaf, such that, when applied to the chroma C of a source color of lightness L that belongs to the corresponding key constant-hue leaf of hue h*, said chroma C is mapped into a chroma C ′ = C max − h * TARGET ⋅ g h * C C max − h * SOURCE, where, in said key constant-hue leaf of hue h*: - C max − h * SOURCE is the chroma of a color at the intersection of a line of constant lightness L with said source color gamut, - C max − h * TRARGET is the chroma of a color at the intersection of said line of constant lightness L with said target color gamut, and where said key constant-hue leaf chroma mapping function g h ∗ is defined as homogeneously growing in the interval [0,1], non-linear, and independent from said lightness L, - for an angular hue sector, determining a continuous angular hue sector chroma mapping function g allowing to map the chroma of any of said source colors belonging to this angular hue sector, such that when applied to the chroma C of a source color of lightness L and hue h that belongs to said angular hue sector, said chroma C is mapped into a chroma C ′′ = C max − h TARGET ⋅ g h C C max − h SOURCE, where, in the constant hue leaf of hue h: - C max − h SOURCE is the chroma of a color at the intersection of a line of constant lightness L with said source color gamut, - C max − h TRARGET is the chroma of a color at the intersection of said line of constant lightness L with said target color gamut, and