Color appearance space to CMYK mapping using relative purity

Details Color appearance space to CMYK mapping using relative purity Color appearance space to CMYK mapping using relative purity

2006-12-26

2006-12-26

Grant, II, Jerome (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S002100, C358S518000

Reexamination Certificate

active

07154636

ABSTRACT:
The present invention relates to a color management method for the conversion of internal color appearance space color values to CMYK device values, by interpolating CMY values from a plurality of CMY to color appearance space lookup tables, wherein each CMY table is associated with a specific value of K. A target internal color value is received and the relative purity of that color is calculated in the CMY space. Next, a black generation value is calculated using the relative purity of the target color. Finally, one of the plurality of CMY lookup tables is selected based on the black generation value, and a CMYK value is provided based on an interpolation from the selected lookup table. In this way, the present invention is able to control the output K value in a color appearance space to CMYK conversion. Accordingly, colors across a wide relative purity range, including natural images, can be reproduced with better accuracy and higher quality.

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U.S. Appl. No. 10/740,395 (Altenhof-Long et al.), pending.
U.S. Appl. No. 10/841,184 (John S. Haikin), pending.

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