Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1998-02-25
1999-11-02
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347240, 358520, 358523, 358525, G03F 308
Patent
active
059780118
ABSTRACT:
The method of the invention provides an improved method for converting primary printer color values to combinations of the primary printer color values and black to achieve improved printer output color representations. The method includes the following steps. A first balanced set of primary printer color combinations (e.g., CMY) is initially derived which provides a balanced gray representation at various levels of primary color concentration. A second balanced set of primary printer color combinations (e.g., CMYK) is derived which provides a balanced gray representation at various levels of color concentration. Next, a set of primary printer colors (CMY) with K is derived, using the first balanced set, which best represents shadow colors, and a maximum color value is chosen therefrom. Then, a similar set of primary printer colors is calculated which best represents highlight values, by interpolating from the chosen maximum color value to a white value. CMYK color values are then determined, using the second set, shadow colors and highlight colors, which represent regions between black, white and maximum color points already found. Next, a color separation action is performed wherein input primary color values are matched, by interpolation, to closest primary printer color values and black that have been derived above. Thereafter, the stored values are utilized to populate a table which enables conversion of input primary printer color values (e.g., CMY) to combinations of such values with black (CMYK) for use during rendering by a printer.
Jacob Steve A.
Johnson David A.
Hewlett--Packard Company
Le N.
Pham Hai C.
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