Selective color correction applied to plurality of local color gamuts
First Claim
1. A method for selective correction of an original colour x in an original colour image, comprising the steps of:
- selecting at least two different colours μ
K, K-1, . . . N, N≧
2, wherein each of the colours μ
K represents a point in a n-dimensional colour space;
defining for each selected colour μ
K a required colour change δ
K ;
defining for each selected colour μ
K a weighting function WK (x); and
applying a colour modification to said original colour x, according to Σ
K WK (x)δ
K, K=1, . . . N wherein WK (μ
J)=0 if K≠
J and WK (μ
K)=1.
3 Assignments
0 Petitions
Accused Products
Abstract
A method is described for selective color correction of an original color image. In one embodiment, a color is selected by picking a colored pixel from the color image and a changed color, having a restricted color change, is associated with the selected color. All original colors, situated within a local color gamut, comprising the selected color, undergo a color modification according to the color change. The effect of the modification decreases as the original color reaches the boundary of the local color gamut. The selected color and changed color may be defined in the native color space, the local color gamut is preferentially defined by an action radius related to a psychometric color space. Two or more selective color corrections may be combined by a weighted mean modification, by choosing for each color change a weight value, which decreases as the selected color is more different from the original color.
110 Citations
17 Claims
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1. A method for selective correction of an original colour x in an original colour image, comprising the steps of:
-
selecting at least two different colours μ
K, K-1, . . . N, N≧
2, wherein each of the colours μ
K represents a point in a n-dimensional colour space;defining for each selected colour μ
K a required colour change δ
K ;defining for each selected colour μ
K a weighting function WK (x); andapplying a colour modification to said original colour x, according to Σ
K WK (x)δ
K, K=1, . . . N wherein WK (μ
J)=0 if K≠
J and WK (μ
K)=1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification