Printing a true-ink reference, and refining gray accuracy,...

Details Printing a true-ink reference, and refining gray accuracy,... Printing a true-ink reference, and refining gray accuracy,...

2006-04-11

2006-04-11

Williams, Kimberly (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S001900, C358S003060, C358S003230, C358S502000, C358S503000, C347S019000, C347S043000, C382S165000

Reexamination Certificate

active

07027182

ABSTRACT:
Ramps are printed with ink of a particular color, and also nominally in that color but by inks of other colors. A measured actual-ink ramp is a standard to fix the other-colors ramp, and correct other printing in those colors. In one aspect a particular color is gray, actual ink black (K), and other-color inks magenta (M), yellow (Y) and cyan (C). In another aspect, actual ink is red (R), green (G) or blue (B); other colors M, Y and C in respective pairs. For gray/black, the K ramp is a zero-chroma standard to lower composite-black (cK) chroma below ˜2.5 ΔE. A sampling aspect prints for each gray tone plural cK-ink combinations preferably bracketing nominal gray values; and searches these for one nearest the particular gray—or most closely bracketing it, for interpolation—for best match. Bracketing is best optimized, by a color-space pattern centered on nominal. Other aspects are taught.

REFERENCES:
patent: 5331438 (1994-07-01), Harrington
patent: 5347369 (1994-09-01), Harrington
patent: 5363318 (1994-11-01), McCauley
patent: 5995714 (1999-11-01), Hadley et al.
patent: 6027201 (2000-02-01), Edge
patent: 6331042 (2001-12-01), Yamada

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