The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 14, 1997
Filed:
Dec. 23, 1994
Edward G Pariser, Oak Park, IL (US);
R. R. Donnelley & Sons Company, Lisle, IL (US);
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.