Color management of halftoned images
First Claim
1. A method that is operative to adjust a color halftoned image or image portion, the method comprising:
- for each pixel in the image or image portion for which adjustment is desired;
selecting a halftoned pixel of the halftoned image or image portion to be a target pixel;
estimating a description of a color associated with the target pixel based on a plurality of color planes;
determining a desired color adjustment for the estimated color description associated with the target pixel;
determining at least one change value for at least one color plane of the target pixel based on the estimated color description and the desired color adjustment;
combining the at least one change value with at least one value of the target pixel, thereby generating an adjusted target pixel; and
quantizing the adjusted target pixel;
thereby generating an adjusted halftoned image or image portion.
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Accused Products
Abstract
Aspects of color of a halftoned image are controlled or adjusted. A method for adjustment can include determining a color description of a color of an area or window associated with a target halftoned pixel, determining a desired adjustment to the color associated with the target pixel, determining a color change value based on the desired adjustment and the color description associated with the target pixel, combining the color change value with at least one value of the target halftoned pixel, thereby generating at least one combined target pixel value and quantizing the at least one combined target pixel value. For instance error diffusion and/or rank-ordered error diffusion is used to perform the quantization. Color adjustments can be based on user preference and/or calibration compensations between original and target devices.
45 Citations
22 Claims
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1. A method that is operative to adjust a color halftoned image or image portion, the method comprising:
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for each pixel in the image or image portion for which adjustment is desired;
selecting a halftoned pixel of the halftoned image or image portion to be a target pixel;
estimating a description of a color associated with the target pixel based on a plurality of color planes;
determining a desired color adjustment for the estimated color description associated with the target pixel;
determining at least one change value for at least one color plane of the target pixel based on the estimated color description and the desired color adjustment;
combining the at least one change value with at least one value of the target pixel, thereby generating an adjusted target pixel; and
quantizing the adjusted target pixel;
thereby generating an adjusted halftoned image or image portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for adjusting color of a halftoned image or image portion, the method comprising:
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determining a color description of a color of an area associated with a target halftoned pixel of the halftoned image or image portion;
determining a desired adjustment to the color associated with the target pixel;
determining a color change value based on the desired adjustment and the color description associated with the target pixel;
combining the color change value with at least one value of the target halftoned pixel, thereby generating at least one combined target pixel value; and
quantizing the at least one combined target pixel value. - View Dependent Claims (11, 12, 13, 14)
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15. An image processing system comprising:
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a color estimator that is operative to receive a halftoned color image or image portion and estimate colors associated with halftoned target pixels of the halftoned color image or image portion;
a color adjustor that is operative to determine color change values for the estimated colors based on a user preference and/or a calibration compensation;
a combiner that is operative to combine respective determined color change values with values of respective halftoned target pixels, thereby generating adjusted target pixel values; and
a quantizer that is operative to quantize the adjusted target pixel values. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification