Image forming apparatus and color converting method thereof
First Claim
1. An image forming apparatus, comprising:
- a scanning unit to scan an image and to output corresponding digital color coordinates;
a determining unit to compute a matrix operation using a reference matrix computed from a standard color gamut and the digital color coordinates, and to determine a local color gamut including the digital color coordinates, from the standard color gamut including a plurality of local color gamuts using the result of the matrix operation;
a matrix selecting unit to select a color conversion matrix that corresponds to the local color gamut, from color conversion matrices corresponding to the plurality of local color gamuts;
a computing unit to compute LAB color coordinates based on the selected color conversion matrix and the digital color coordinates;
a storage unit to pre-store the reference matrix and the color conversion matrices; and
a color measuring unit to color-measure the image and to output corresponding color-measured LAB color coordinates,wherein the reference matrix represents a correlation between the color-measured LAB color coordinates and the digital color coordinates.
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Abstract
An image forming apparatus including a scanning unit to scan an image and to output corresponding digital color coordinates; a determining unit to determine a local color gamut including the digital color coordinates, based on a reference matrix computed from a standard color gamut, which includes the local color gamut, and the plurality of digital color coordinates; a matrix selecting unit to select a color conversion matrix that corresponds to the determined local color gamut; and a computing unit to compute LAB color coordinates based on the selected color conversion matrix and the digital color coordinates. A method of color conversion using the image forming apparatus is also provided.
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Citations
12 Claims
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1. An image forming apparatus, comprising:
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a scanning unit to scan an image and to output corresponding digital color coordinates; a determining unit to compute a matrix operation using a reference matrix computed from a standard color gamut and the digital color coordinates, and to determine a local color gamut including the digital color coordinates, from the standard color gamut including a plurality of local color gamuts using the result of the matrix operation; a matrix selecting unit to select a color conversion matrix that corresponds to the local color gamut, from color conversion matrices corresponding to the plurality of local color gamuts; a computing unit to compute LAB color coordinates based on the selected color conversion matrix and the digital color coordinates; a storage unit to pre-store the reference matrix and the color conversion matrices; and a color measuring unit to color-measure the image and to output corresponding color-measured LAB color coordinates, wherein the reference matrix represents a correlation between the color-measured LAB color coordinates and the digital color coordinates. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A color converting method, comprising:
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scanning an image and outputting corresponding digital color coordinates; computing a matrix operation using a reference matrix computed from a standard color gamut and the digital color coordinates, determining a local color gamut of a standard color gamut, using the result of the matrix operation, wherein the standard color gamut comprises a plurality of local color gamuts, and the determined local color gamut comprises the digital coordinates; selecting a color conversion matrix that corresponds to the determined local color gamut, from pre-stored color conversion matrices corresponding to the plurality of local color gamuts; computing LAB color coordinates based on the selected color conversion matrix and the digital color coordinates; and color-measuring the image and outputting corresponding color-measured LAB color coordinates, wherein the reference matrix represents a correlation between the color-measured LAB color coordinates and the digital color coordinates. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification