Color error diffusion method
First Claim
1. A color error diffusion method effective between a color image input device operating in one color space and a color image output device operating in another color space, said method comprisingpreparing a final color palette for use in a final vector error diffusion activity and intermediate color image input and output devices, andbasing that preparing upon a reverse color conversion step which is effectively applied to a generated calibrated color profile associated with operation of the color image input device wherein the basing involves establishing an initial color palette associated directly with the operation of the color image input device, and then, by utilizing that initial color palette in an initial vector error diffusion activity preceding the final vector error diffusion activity as conducted in the color image input device'"'"'s operating color space, generating the generated calibrated color profile.
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Abstract
A color error diffusion method effective between a color image input device operating in one color space and a color image output device operating in another color space. The method includes the steps of (a) preparing a final color palette for use in a practice of vector error diffusion intermediate the color image input and output devices, and (b) basing that preparing upon a reverse color conversion step which is effectively applied to a generated calibrated color profile associated with operation of the color image input device.
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Citations
10 Claims
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1. A color error diffusion method effective between a color image input device operating in one color space and a color image output device operating in another color space, said method comprising
preparing a final color palette for use in a final vector error diffusion activity and intermediate color image input and output devices, and basing that preparing upon a reverse color conversion step which is effectively applied to a generated calibrated color profile associated with operation of the color image input device wherein the basing involves establishing an initial color palette associated directly with the operation of the color image input device, and then, by utilizing that initial color palette in an initial vector error diffusion activity preceding the final vector error diffusion activity as conducted in the color image input device'"'"'s operating color space, generating the generated calibrated color profile.
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9. A color error diffusion method effective between a color image input device operating in one color space and a color image output device operating in another color space, said method comprising
with respect to the color image input device, performing a first color conversion from that device'"'"'s operating color space to a selected transitional color space which is a generic version of the color image output device'"'"'s operating color space, creating an initial color palette from this first color conversion, using the created initial color palette in an initial vector error diffusion process, preparing test color calibration images, and from these images generating a calibrated color profile which is associated with the operation of the color image input device, from the generated calibrated color profile, producing a color look-up table which relates the color image input device'"'"'s operating color space to the color image output device'"'"'s operating color space, and from the produced look-up table, and employing, effectively, the performance of a second, reverse color conversion step, preparing a final color palette which relates the color image input device'"'"'s operating color space to each of the possible output colors that are producible by the color image output device in its operating color space, and applying the final color palette intermediate the color image input and output devices including in a final vector error diffusion process performed subsequent to the initial vector error diffusion process.
Specification