Constructing extended color gamut digital images from limited color gamut digital images
First Claim
1. A method for reconstructing an extended color gamut digital image from a limited color gamut digital image represented in a particular limited color gamut color space which was derived from an initial extended color gamut image, comprising:
- a) transforming the limited color gamut digital image in the particular limited color gamut color space to a reference color space forming a limited color gamut digital image in a reference color space;
b) providing a modified inverse color adjustment function which, when such function operates on the limited color gamut digital image in the reference color space, produces the reconstructed extended color gamut digital image having reduced highlight color saturation for highlight color values when compared with corresponding color values of the initial extended color gamut image; and
c) operating on the limited color gamut digital image in the reference color space with the modified inverse color adjustment function to form the reconstructed extended color gamut digital image having reduced levels of color contouring and quantization artifacts.
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Accused Products
Abstract
A method for reconstructing an extended color gamut digital image from a limited color gamut digital image includes transforming the limited color gamut digital image in the particular limited color gamut color space to a reference color space forming a limited color gamut digital image in a reference color space; providing a modified inverse color adjustment function which, when such function operates on the limited color gamut digital image in the reference color space, produces the reconstructed extended color gamut digital image having reduced highlight color saturation for highlight color values when compared with corresponding color values of the initial extended color gamut image; and operating on the limited color gamut digital image in the reference color space with the modified inverse color adjustment function to form the reconstructed extended color gamut digital image having reduced levels of color contouring and quantization artifacts.
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Citations
13 Claims
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1. A method for reconstructing an extended color gamut digital image from a limited color gamut digital image represented in a particular limited color gamut color space which was derived from an initial extended color gamut image, comprising:
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a) transforming the limited color gamut digital image in the particular limited color gamut color space to a reference color space forming a limited color gamut digital image in a reference color space;
b) providing a modified inverse color adjustment function which, when such function operates on the limited color gamut digital image in the reference color space, produces the reconstructed extended color gamut digital image having reduced highlight color saturation for highlight color values when compared with corresponding color values of the initial extended color gamut image; and
c) operating on the limited color gamut digital image in the reference color space with the modified inverse color adjustment function to form the reconstructed extended color gamut digital image having reduced levels of color contouring and quantization artifacts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11)
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9. A method for reconstructing an extended color gamut digital image from a limited color gamut digital image represented in a particular limited color gamut color space which was derived from an initial extended color gamut image, comprising:
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a) providing a set of modified inverse color adjustment functions corresponding to a set of limited color gamut color spaces which, when such functions operate on a limited color gamut digital image in the corresponding limited color gamut color space, produces the reconstructed extended color gamut digital image having reduced highlight color saturation for highlight color values when compared with corresponding color values of the initial extended color gamut image;
b) selecting the modified inverse color adjustment function corresponding to the particular limited color gamut color space; and
c) operating on the limited color gamut digital image in the particular limited color gamut color space with the selected modified inverse color adjustment function to produce the reconstructed extended color gamut digital image having reduced levels of color contouring and quantization artifacts. - View Dependent Claims (12)
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10. A method for reconstructing extended color gamut digital image from a limited color gamut digital image which was derived from an initial extended color gamut image, comprising:
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a) providing a modified inverse color adjustment function which, when such function operates on the limited color gamut digital image, produces the reconstructed extended color gamut digital image having reduced highlight color saturation for highlight color values when compared with corresponding color values of the initial extended color gamut image;
c) operating on the limited color gamut digital image with the modified inverse color adjustment function to construct the reconstructed extended color gamut digital image having reduced levels of color contouring and quantization artifacts; and
d) applying an image enhancement algorithm to the reconstructed extended color gamut digital image. - View Dependent Claims (13)
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Specification