Color processing
AssigneeKodak Polychrome Graphics LLC
InventorsChristopher J. Edge, William A. Rozzi, Timothy A. Fischer
Life of this patent
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Abstract
A method of characterizing a color imaging system is provided. The method comprises obtaining first data indicative of output of the color imaging system. The first data is processed, to yield second data, according to a color appearance model that varies in accordance with neutrality of colors indicated by the first data. Other methods are provided as well as systems and computer program products for characterizing color imaging systems and devices and for producing colors.
Claims17
A method of characterizing a color imaging system, the method comprising:
- obtaining first data indicative of output of the color imaging system;
- processing the first data, to yield second data, according to a color appearance model that varies in accordance with neutrality of colors indicated by the first data, wherein the color appearance model varies according to a white reference vector that is a weighted combination of a local white point of the color imaging system and a common white point, the white reference vector being weighted more to the local white point the more a color indicated by the first data is neutral and being weighted more to the common white point the more the indicated color is saturated.
A computer program product residing on a computer readable medium, for characterizing a color imaging system, comprising instructions for causing a computer to:
- obtain first data indicative of output of the color imaging system;
- process the first data, to yield second data, according to a color appearance model that varies in accordance with neutrality of a color indicated by the first data, wherein the color appearance model varies according to a white reference vector that is a weighted combination of a local white point of the color imaging system and a common white point the white reference vector being weighted more to the local white point the more a color indicated by the first data is neutral and being weighted more to the common white point the more the indicated color is saturated.
A method of producing a color with an emissive device using absolute colorimetry, the method comprising:
- obtaining first data indicative of a first color;
- determining second data related to the first data by a color appearance model that uses a white point of the emissive device as a white reference vector;
- and
- actuating the emissive device according to the second data to implement absolute colorimetry to produce a second color to approximate the first color, wherein the white reference vector varies from the white point of the emissive device when the second color is near white to a common white reference, different from the white point of the emissive device, when the second color departs from a near-white, neutral color.
A method of characterizing an emissive device for absolute colorimetry, the method comprising:
- obtaining first data indicative of output of the emissive device;
- converting the first data to second data using a color appearance model that uses a white point of the emissive device as a reference white vector;
- providing the second data for use in absolute calorimetric color reproduction, wherein converting the first data to second data further includes using, as the white reference vector, a composite white reference vector that is a weighted combination of the white point of the emissive device and a predetermined white point, the composite white reference vector being closer to the white point of the emissive device the closer a color indicated by the first data is to being neutral.
A computer program product residing on a computer readable medium, for characterizing an emissive device for absolute colorimetry, comprising instructions for causing a computer to:
- obtain first data indicative of output of the emissive device;
- convert the first data to second data using a color space that uses a white point of the emissive device as a reference white vector;
- and
- provide the second data for use in absolute colorimetric color reproduction, wherein the instructions cause the computer to convert the first data to second data using, as the white reference vector, a composite white reference vector that is a weighted combination of the white point of he emissive device and a predetermined white point, the composite white reference vector being closer to the white point of the emissive device the closer a color indicated by the first data is to being neutral.
Dependencies are inferred from the claim text.