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US 10,832,106 B2Granted
Combining lookup tables
AssigneeHewlett-Packard Development Company, L.P.
InventorsJan Morovic, Peter Morovic
Life of this patent
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Abstract
A method is disclosed in which a lookup table (LUT) that maps chromatic and achromatic device color space vectors into Neugebauer primary area coverages (NPacs) is obtained. According to the method, a LUT that maps chromatic device color space vectors into NPacs is combined with a LUT that maps achromatic device color space vectors into NPacs.
Claims17
A method comprising:
- defining a first initial lookup table (LUT) that maps chromatic device color space vectors into NPacs to be associated to first achromatic device color values and a second initial LUT that maps chromatic device color space vectors into Neugebauer primary area coverage (NPacs) to be associated to second achromatic device color values;
- defining a first LUT by selecting entries from the first initial LUT and the second initial LUT;
- combining the first LUT that maps chromatic device color space vectors into the NPacs with a second LUT that maps achromatic device color space vectors into NPacs, to obtain a third LUT that maps chromatic and achromatic device color space vectors into NPacs;
- and
- outputting the third LUT for an image processing pipeline of a printing system to generate hardcopy printed documents based on the third LUT.
2 more elements
A system comprising:
- a LUT generating device to provide a first lookup table (LUT) and a second LUT, the first LUT to map chromatic device color space vectors into Neugebauer primary area coverages (NPacs), and the second LUT to map achromatic device color space vectors into NPacs;
- and
- a combiner to combine values of the LUT with values of the second LUT, to obtain a third LUT that maps chromatic and achromatic device color space vectors into NPacs,
- wherein the LUT generating device is to generate the first LUT by defining a first initial LUT that maps chromatic device color space vectors into NPacs to be associated to first achromatic device color values and a second initial LUT that maps chromatic device color space vectors into NPacs to be associated to second achromatic device color values.
1 more element
A non-transitory processor readable storage medium comprising instructions that, when executed by the processor, cause the processor to:
- combine values from entries of a first lookup table (LUT) that maps device color space vectors into Neugebauer primary area coverages (NPacs) with values from entries of a second LUT that maps device color space vectors into NPacs, to obtain a third LUT that maps device color space vectors into NPacs, wherein the first LUT includes values for a first portion of a device color space and the second LUT includes values for a second, different portion of the device color space;
- output the third LUT for use by an image processing pipeline of a printing system to generate hardcopy printed documents based on the third LUT;
- and
- generate the first LUT by defining a first initial LUT and a second initial LUT that map chromatic device color space vectors into NPacs according to a condition associated to values of the device color space.
1 more element
Dependencies are inferred from the claim text.