Color image forming apparatus

U.S. Patent Number: 5724443

Abstract: In a color image forming apparatus, a color document read by image inputting means is converted to RGB data and then to L*a*b* data. The L*a*b* data are subjected to image processing and then transformed to RGB data. Further, the RGB data are transformed to YMCK data. Image outputting means sequentially superposes color materials on a paper on the basis of the YMCK data, thereby reproducing the color document. Recognizing means recognizes a color rendering range for the L*a*b* data and a color reproducible range available with the outputting means. Data representative of the color rendering ranges of the inputting means and outputting means are stored in a data storage and supplied to the recognizing means.

Inventors: Nishikawa; Yoshiaki (Yokohama, JP)

Assignee: Ricoh Company, Ltd. (Tokyo, JP)

Application Number: 08/511,189

Issued: 1998-03-03

Expired: 2006-03-03

Classes: 382/167 ; 358/518; 358/523

Field of search: 358/518,520,523,534,515,519,535,530,504 382/166,167 395/131,109

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