Patterning and dot gain improvement for vector error diffusion
First Claim
1. A method for processing color-image pixel-data for outputting by a multi-bit (N) color-image output device comprising characterizing color-image pixels into N successive, associated scan lines of pixels, which lines are bridged, effectively for processing purposes, by successive N×
- N pixel groups distributed along the associated scan lines, and for each such pixel group, applying processing to the pixels in the group, including vector error diffusion processing, in a pixel-by-pixel and scan-line-by-scan-line manner employing, cyclically, N different color palettes, one each for the different scan lines, and one of which palettes is bi-tonal, and other(s) of which is (are) of a higher bit level up to the level N.
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Abstract
A method for processing color-image pixel-data for outputting by a multi-bit (N) color-image output device including the steps of (a) characterizing color-image pixels into N successive, associated scan lines of pixels, which lines are bridged, effectively for processing purposes, by successive N×N pixel groups distributed along the associated scan lines, and (b) for each such pixel group, applying processing to the pixels in the group, including vector error diffusion processing, in a pixel-by-pixel and scan-line-by-scan-line manner employing, cyclically, N different color palettes, one each for the different scan lines—one of which palettes is bi-tonal, and other(s) of which is (are) of a higher bit level up to the level N.
13 Citations
6 Claims
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1. A method for processing color-image pixel-data for outputting by a multi-bit (N) color-image output device comprising
characterizing color-image pixels into N successive, associated scan lines of pixels, which lines are bridged, effectively for processing purposes, by successive N× - N pixel groups distributed along the associated scan lines, and
for each such pixel group, applying processing to the pixels in the group, including vector error diffusion processing, in a pixel-by-pixel and scan-line-by-scan-line manner employing, cyclically, N different color palettes, one each for the different scan lines, and one of which palettes is bi-tonal, and other(s) of which is (are) of a higher bit level up to the level N. - View Dependent Claims (2)
- N pixel groups distributed along the associated scan lines, and
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3. A method for processing color-image pixel data for outputting by a multi-bit color-image output device comprising
providing at least two different color palettes for employment during said processing, one of which palettes is bi-tonal, and the other of which is multi-bit in nature, and implementing processing in a manner whereby such different color palettes are employed in a selected, one-after-another fashion.
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4. A method for vector-error-diffusion processing of color-image pixel data for outputting by a multi-bit color-image output device comprising
recognizing different pixel image positions in a color image to be processed, and then using selected, different color palettes for pixels in selected, different image positions in that image.
Specification