A method of mapping color values of an oligochromatic pattern, which is a decorative pattern formed by color shade combinations of minimum two and maximum eight dominant colors and wherein said oligochromatic pattern is a wood pattern, having an elongated image-gamut, the method comprises the following steps: - determining an image-gamut of said oligochromatic pattern, in a N-dimensional device independent color system (N>1); wherein said image-gamut comprises color values of said oligochromatic pattern; and - determining a skeleton (500; Fig. 5) of said image-gamut; and - performing a set of N-dimensional transformation steps on said skeleton as adaptation in said N-dimensional device independent color system and determining for points of said skeleton a path in said N-dimensional device independent color system that corresponds to said adaption; and - mapping said color values of said oligochromatic pattern along said determined paths (35; Fig 7) and wherein the method is preferably for forming a decorative layer and wherein said skeleton comprises a plurality of points, which are determined by: a1) selecting a straight line in the N-dimensional device independent color system; and a2) selecting a range, along said selected straight line; and b) selecting a sub-image-gamut of said image-gamut; wherein said sub-image-gamut comprises color values whereof a projection towards said selected straight line belongs to said range; and c) selecting a balance point in said sub-image-gamut as a point of said skeleton. which is a decorative pattern formed by color shade combinations of minimum two and maximum eight dominant colors and wherein said oligochromatic pattern is a wood pattern, having an elongated image-gamut, the method comprises the following steps: - determining an image-gamut of said oligochromatic pattern, in a N-dimensional device independent color system (N>1); wherein said image-gamut comprises color values of said oligochromatic pattern; and - determining a skeleton (500; Fig. 5) of said image-gamut; and - performing a set of N-dimensional transformation steps on said skeleton as adaptation in said N-dimensional device independent color system and determining for points of said skeleton a path in said N-dimensional device independent color system that corresponds to said adaption; and - mapping said color values of said oligochromatic pattern along said determined paths (35; Fig 7) and wherein the method is preferably for forming a decorative layer and wherein said skeleton comprises a plurality of points, which are determined by: a1) selecting a straight line in the N-dimensional device independent color system; and a2) selecting a range, along said selected straight line; and b) selecting a sub-image-gamut of said image-gamut; wherein said sub-image-gamut comprises color values whereof a projection towards said selected straight line belongs to said range; and c) selecting a balance point in said sub-image-gamut as a point of said skeleton. - determining an image-gamut of said oligochromatic pattern, in a N-dimensional device independent color system (N>1); wherein said image-gamut comprises color values of said oligochromatic pattern; and - determining a skeleton (500; Fig. 5) of said image-gamut; and - performing a set of N-dimensional transformation steps on said skeleton as adaptation in said N-dimensional device independent color system and determining for points of said skeleton a path in said N-dimensional device independent color system that corresponds to said adaption; and - mapping said color values of said oligochromatic pattern along said determined paths (35; Fig 7) and wherein the method is preferably for forming a decorative layer and wherein said skeleton comprises a plurality of points, which are determined by: a1) selecting a straight line in the N-dimensional device independent color system; and a2) selecting a range, along said selected straight line; and b) selecting a sub-image-gamut of said image-gamut; wherein said sub-image-gamut comprises color values whereof a projection towards said selected straight line belongs to said range; and c) selecting a balance point in said sub-image-gamut as a point of said skeleton. a1) selecting a straight line in the N-dimensional device independent color system; and a2) selecting a range, along said selected straight line; and b) selecting a sub-image-gamut of said image-gamut; wherein said sub-image-gamut comprises color values whereof a projection towards said selected straight line belongs to said range; and c) selecting a balance point in said sub-image-gamut as a point of said skeleton.