Digital color assessment
AssigneeGraftek Imaging Inc.
InventorsRomik Chatterjee, Eric Heinen, Robert Eastlund
Life of this patent
Estimating the term…
Abstract
Assessing color digitally can include imaging digitally a custom color calibration chart under a set of lighting conditions; imaging digitally a workpiece under substantially identical lighting conditions; and comparing color measurement data from the custom color calibration chart to color measurement data from the workpiece to characterize the workpiece.
Claims18
1-20. (canceled)
A method of creating a color target specification for a workpiece, comprising:
- digitally imaging the workpiece;
- estimating a first set of L*a*b* values from the digital image of the workpiece;
- selecting a first set of colors from a wide gamut of colors related to the first set of L*a*b* values;
- creating a digital chart of the first set of colors;
- printing the digital chart;
- measuring the first set of colors, from the printed chart, to create a second set of L*a*b* values;
- calculating a Delta E value between the first set of L*a*b* values and the second set of L*a*b* values;
- determining whether or not the Delta E value is below a predetermined threshold;
- and,
- if the Delta E is below the predetermined threshold, then creating the color target specification.
A method of creating a color target specification for a workpiece, comprising:
- digitally selecting a color target for the workpiece;
- estimating a first set of L*a*b* values from the color target;
- selecting a first set of colors from a wide gamut of colors related to the first set of L*a*b* values;
- creating a digital chart of the first set of colors;
- printing the digital chart;
- measuring the first set of colors, from the printed chart, to create a second set of L*a*b* values;
- calculating a Delta E value between the first set of L*a*b* values and the second set of L*a*b* values;
- determining whether or not the Delta E value is below a predetermined threshold;
- and,
- if the Delta E is below the predetermined threshold, then creating the color target specification.
A method of creating a color target specification for a workpiece, comprising:
- estimating a first set of space-specific color values corresponding to a workpiece, said space-specific color values defined in a color space that encompasses all visible colors and is an absolute standard;
- selecting a first set of colors from a wide gamut of colors related to the first set of space-specific color values;
- creating a digital chart of the first set of colors;
- printing the digital chart;
- measuring the first set of colors, from the printed chart, to create a second set of space-specific color values in the color space that encompasses all visible colors and is an absolute standard;
- calculating an error measurement between the first set of space-specific color values and the second set of space-specific color values;
- determining whether or not the error measurement is below a predetermined threshold;
- and,
- if the error measurement is below the predetermined threshold, then creating the color target specification.
Dependencies are inferred from the claim text.