Color printing method and apparatus which compensates for Abney effect
First Claim
1. A color printer look-up table for providing color primary values corresponding to colors in device-independent color space, the color primary values having warped hue angles which compensate for the Abney effect.
2 Assignments
0 Petitions
Accused Products
Abstract
Method and apparatus for color printing according to a printer table in which the hue angle of the colors in the printer table are warped so as to compensate for the Abney effect. A color printer gamut edge is first determined through printer gamut measurement, and color primary values within the printer gamut and outside the printer gamut are calculated and inserted into the printer table. If desired, a border table may be provided for colors outside the printer table. The hue angles for the printer table and the border table are then warped, for example, by stretching some ranges of hue angles and by compressing other ranges of hue angles, so that out-of-gamut colors are printed with a hue that is perceived to be the same as the hue of the desired color.
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Citations
43 Claims
- 1. A color printer look-up table for providing color primary values corresponding to colors in device-independent color space, the color primary values having warped hue angles which compensate for the Abney effect.
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10. A color printer driver comprising:
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a printer table for providing color primary values corresponding to colors within the color printer gamut and for colors outside the color printer gamut, the color primary values outside the color printer gamut having warped hue angles whereby the Abney effect is compensated; means for accepting a command for printing a designated color; and control means for extracting from the printer table the color primary values corresponding to the designated color. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. Apparatus for color printing comprising:
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a color printer for printing color images in response to color primary commands, said color printer having a gamut of printable colors; a color monitor for displaying colors within a gamut of displayable colors; a processing unit including a computer for executing stored program process steps, said processing unit including a color monitor interface for providing color primary values to said color monitor and a color printer interface for providing color primary values to said color image forming means; and a memory for storing process steps for execution by said processing unit; said process steps including steps to derive a color image, to provide color primary values via said color monitor interface to said color monitor in correspondence to said color image, and to provide color primary values via said color printer interface to said color printer in correspondence to said color image, wherein for colors outside the gamut of printable colors the hue angles are warped such that the hue of displayed images is perceived the same as the hue of printed images. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for building a printer table comprising:
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determining a color printer gamut edge; mapping color primary values into the printer table for colors within the color printer gamut edge; mapping color primary values into the printer table for colors outside the color printer gamut edge; and warping hue angles for the color primary values. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification