Patent ID: 8379048
Filing Date: 2013-02-19
Classification: H04N

Abstract:
1. A method of converting a source image representing a reference image to a digital representation of a preferred image as identified by a viewer, wherein said source image comprises pixels rendered in a first color space and said representation of said preferred image is rendered in an extended gamut destination color space obtainable with a colorant set comprising cyan, magenta, yellow and at least one redundant color other than black, the method comprising the steps of: a) determining source values of lightness, chroma, and hue for each of the pixels in the source image; b) displaying a graphical representation of the source image; c) for each pixel in the source image, determining additional available chroma, defined by an absolute or reasonable maximum chroma value attainable in the extended gamut destination color space minus the source chroma value, wherein the absolute maximum chroma value for the digital representation is equivalent to an absolute maximum chroma available in the destination color space, the additional available chroma for a point on a gamut boundary of the source image is defined by the absolute maximum chroma value, and the additional available chroma for a point inside the source image gamut boundary is defined by the reasonable maximum chroma value less than the absolute maximum chroma value; d) receiving instructions via a user interface for assigning to each of the pixels a preferred chroma value, comprising the source chroma value plus a percentage of the additional available chroma, the percentage of the additional available chroma for all pixels in at least a portion of the preferred image defined by one or more mathematical functions selected by the viewer dependent upon at least one of the source lightness value, the source chroma value, or the source hue value in the corresponding portion of the source image, said preferred chroma value being within the extended gamut destination color space at said source lightness value and said source hue value, at least some of said pixels having a preferred chroma value greater than the source chroma value; e) displaying a graphical representation of the preferred image comprising said preferred chroma values; and f) converting the digital representation of the preferred image to the extended gamut destination color space and storing the converted digital representation on a computer readable medium in the form of computer readable code, wherein the converted digital representation represents for each pixel the source lightness value, the source hue value, and the preferred chroma value.