Replacing A Defective Colorant
First Claim
Patent Images
1. A method of forming an image using a plurality of device-dependent colorants, comprising:
- receiving at least one raster of halftoned image pixels each having a discrete value for each of the colorants;
for a raster associated with a defective colorant, modifying the values of the pixels to replace the defective colorant with an added amount of at least one non-defective colorant, the amount for each individual pixel determined according to a predetermined non-linear relationship from a local density of the defective colorant at the corresponding pixel.
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Abstract
A system and methods for modifying the values of halftoned image pixels to replace a defective colorant with at least one non-defective colorant.
15 Citations
20 Claims
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1. A method of forming an image using a plurality of device-dependent colorants, comprising:
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receiving at least one raster of halftoned image pixels each having a discrete value for each of the colorants; for a raster associated with a defective colorant, modifying the values of the pixels to replace the defective colorant with an added amount of at least one non-defective colorant, the amount for each individual pixel determined according to a predetermined non-linear relationship from a local density of the defective colorant at the corresponding pixel. - View Dependent Claims (2, 3, 4, 5)
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6. A printing system for printing color image data using a plurality of colorants, comprising:
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a plurality of print elements each configured to emit drops of one of the colorants to print halftoned pixels of a raster of the data, each pixel having a drop value for each of the colorants; a detector to identify a defective one of the print elements; a color replacer to modify the drop values of the pixels to replace the colorant of the defective print element with an added amount of colorant from at least one non-defective print element, the added amount determined for each individual pixel according to a predetermined non-linear relationship from a local density at the individual pixel of the colorant of the defective print element. - View Dependent Claims (7, 8, 9)
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10. A method of forming an image using a plurality of device-dependent colorants, comprising:
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transforming a raster of halftoned image pixels each having one of N discrete values for each of the colorants to a human-vision-equivalent raster that replaces a defective one of the colorants by, for each pixel, converting the value for each non-defective colorant to a count, and adding the count to a total count for that non-defective colorant, converting the value for the defective colorant to a second count for at least one of the non-defective colorants, and adding the second count to the total count for that non-defective colorant, and re-halftoning the total counts of the non-defective colorants to generate a new value for the pixel. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification