Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1993-08-05
1996-02-20
Reinhart, Mark J.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
358298, H04N 121
Patent
active
054933234
ABSTRACT:
Halftone screens are generated for each separation in accordance with the goal of avoiding overlapping whenever possible. Initially, the black separation is halftoned, generating a dot with a number of ON pixels and OFF pixels in accordance with the area density of the black separation. Next, a first color separation is halftoned, setting a number of the previous OFF pixels to ON. Then, if any white pixels remain, the second color separation is halftoned, setting a number of the previously OFF pixels to ON. After the second color separation is halftoned, if any OFF pixels remain, the third color separation is halftoned, setting a number of the previous OFF pixels to ON. If during the processing of the second and third separations, it is determined that no OFF pixels exist to be turned ON, second and third layers of color is started, respectively superimposed over the first layer and then, if required, superimposed over the second layer. Each layer is started and arranged so that the additional colors forming the dot are not placed on any black areas.
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Sigfredo I. Nin et al, "Printing CIELAB Images on a CMYK Printer Using Tri-Linear Interpolation", SPIE Proceedings, vol. 1670, 1992, pp. 316-324.
Costello Mark
Reinhart Mark J.
Xerox Corporation
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