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EP0203448A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Matching hardcopy color to display color

Assignee: Tektronix Inc
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Filing: 1986-05-13
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Granted: —
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Expires: 2006-05-13
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Abstract

Abstract A method for matching hardcopy color to display color for registered-dot ink-jet copies. Video RGB is converted into chromaticity coordinates in XYZ color space. An explicit solution is achieved by defining a new MSW color space which restricts the hardcopy colors to some percentage of one of the binary Mixtures of inks, some percentage of one of the Single inks, and some percentage of paper White. The color data in XYZ space is converted to MSW space and unreachable colors are mapped into reachable colors. Correction for hardcopy non linearities is accomplished by considering the interaction among the inks by using a coverage ratio to correct for color shifts. The MSW values are, thus, converted to CMY values which are sent to an appropriate dithering algorithm for conversion into dots on the paper.

Inventors

  • 👤 Paul A. Mcmanus
  • 👤 Gregory L. Hoffman

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-25 00:05
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6058

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 66 words
A method for matching hardcopy color to video display color comprising the steps of: transforming normalized video color data into MSW color data where MSW color data has a binary mixture component, a single component and a white component; manipulating said MSW color data to convert unreachable video color data into reachable hardcopy color data; and converting said manipulated MSW color data into hardcopy color data.
Claim 2
Independent Claim 66 words
A method for matching hardcopy color to video display color comprising the steps of: transforming normalized video color data into MSW color data where MSW color data has a binary mixture component, a single component and a white component; manipulating said MSW color data to convert unreachable video color data into reachable hardcopy color data; and converting said manipulated MSW color data into hardcopy color data.
Claim 3
Dependent Claim 47 words
A method as recited in claim 1 wherein said converting step comprises the steps of: computing a coverage ratio to compensate for interactions between components of said hardcopy color data; and using said coverage ratio to determine new values for said components of said hardcopy color data.
Claim 4
Dependent Claim 45 words
A method as recited in claim 1 wherein said transforming step comprises the steps of: transforming said normalized video color data into XYZ space where all color components have a positive value; and tranforming color data in said XYZ space into said MSW color data.
Claim 5
Dependent Claim 34 words
A method as recited in claim 3 wherein said transforming into XYZ space step comprises the step of weighting the conversion matrix to be used so that video and hardcopy color whites are coincident.

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