Method of and apparatus for converting between a color appearance space and a colorant space
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United States of America Patent
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Oct 14, 1997
Grant Date -
N/A
app pub date -
Dec 23, 1994
filing date -
Mar 10, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus converts from a color appearance space to a colorant space and determines quantities of colorants required to reproduce a color in a medium. A set of input color signals representing a desired or measured color in the color appearance color space is developed and compared to a set of calculated color signals, representing an estimate of the color in the color appearance space, to produce an error signal. A set of scan estimate signals representing color components are generated and converted into a set of colorant estimate signals which represent quantities of colorants in the colorant space required to reproduce the color estimate in the medium. The set of colorant estimate signals are mapped into the color appearance space, according to the characteristics of an output device which is to reproduce the color in the medium, to produce the set of calculated color signals. The set of scan estimate signals are iteratively altered in response to the error signal to develop a set of calculated color signals which approximates the set of input color signals according to an error criterion.
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