Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Patent
1993-02-25
1996-02-20
Fuller, Benjamin R.
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
347124, 347188, 355208, 358300, H04N 146, G03G 1501
Patent
active
054933218
ABSTRACT:
An improved method and apparatus for characterizing a full color gamut of a digital photosensitive color proofing system having at least two separately controllable process parameters uses a one page color standard for calibrating the full color gamut. The one page color standard includes a plurality of color density test areas on the page, with each color density test area having a test patch for each colorant printed at a selected color density that is within a range of color densities, and a plurality of tone rendition test areas on the same page. There is one tone rendition area for each of the color density test areas, and each tone rendition test area has a plurality of test tints for each colorant as a primary color and a plurality of test patches for a set of secondary colors composed from combinations of the primary colors. The method for producing the one page color standard includes the steps of adjusting a first process parameter to produce the plurality of color density test areas, adjusting a second process parameter to produce the plurality of tone rendition test areas, and then printing the single color standard or test pattern page. The characterization process of the present invention involves the steps of measuring selected ones of the test patches and test tints to define or characterize the full color gamut, including a primary color gamut, a secondary color gamut and tone renditions, for the range of color densities. An optional step of mapping or matching the full color gamut of the color proofing system to a full color gamut of a target printing system by establishing the required first and second process parameters can be performed to best optimize a two-dimensional color transfer function between the two color gamuts.
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Bauer William D.
Fuller Benjamin R.
Gordon Raquel Yvette
Griswold Gary L.
Kirn Walter N.
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