초록 ▼

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

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.

대표청구항 ▼

A method of determining quantities of colorants used by a particular output device to produce a color, comprising the steps of: (a) developing a set of color appearance input color signals representing the color in a color appearance space; and using a processor to implement the steps of; (b) choosi

A method of determining quantities of colorants used by a particular output device to produce a color, comprising the steps of: (a) developing a set of color appearance input color signals representing the color in a color appearance space; and using a processor to implement the steps of; (b) choosing an initial set of scan estimate signals; (c) converting the scan estimate signals into a set of colorant estimate signals; (d) mapping the set of colorant estimate signals into the color appearance space according to a color reproduction characteristic of the particular output device to produce a set of calculated color signals representing an approximation of the color in the color appearance space; (e) comparing the set of color appearance input color signals to the set of calculated color signals to produce an error signal; (f) altering the set of scan estimate signals in response to the error signal; and (g) repeating steps (c)-(f) until an error criterion is satisfied at step (e), whereupon the colorant estimate signals represent the quantities of colorants used by the particular output device to produce the color.