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US 2011/0235141 A1Published application
Spot Color Matching Mechanism
OwnerVladimir V. Shestak, Yue Qiaoinventors
Life of this patent
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Abstract
An apparatus is disclosed. The apparatus includes a color image recording device to measure a spot color on a medium and a color matching module to determine a perceptual color difference between the measured spot color and a reproduction color as a function of color values in a color space and to optimize the function to establish a minima.
Claims20
A computer generated method comprising:
- measuring a spot color on a medium in a device independent color space;
- converting the measured spot color to a profile color value for a printer;
- generating a test chart by sampling a color space within a distance in each dimension from the profile color value;
- determining color differences between the measured color value and each test chart sample value;
- generating a functional dependency between the color differences and a color space of the printer;
- searching to find a color combination that minimizes functional dependency between the color differences and a color space of the printer;
- establishing the profile color value as a local minimum value if a search value lies inside a color area around the profile color value;
- and
- applying the local minimum value to a transform that translates an input color space into the color space of the printer.
6 more elements
An apparatus, comprising:
- a color image recording device to measure a spot color on a medium;
- and
- a color matching module to determine a perceptual color difference between the measured spot color and a reproduction color as a function of color values in a color space and to optimize the function to establish a minima.
An article of manufacture comprising a machine-readable medium including data that, when accessed by a machine, cause the machine to perform operations comprising:
- measuring a spot color on a medium in a device independent color space;
- converting the measured spot color to a profile color value for a printer;
- generating a test chart by sampling a color space within a distance in each dimension from the profile color value;
- determining color differences between the measured color value and each test chart sample value;
- generating a functional dependency between the color differences and a color space of the printer;
- searching to find a color combination that minimizes functional dependency between the color differences and a color space of the printer;
- establishing the profile color value as a local minimum value if a search value lies inside a color area around the profile color value;
- and
- applying the local minimum value to a transform that translates an input color space into the color space of the printer.
6 more elements
Dependencies are inferred from the claim text.