COLOR CONVERSION METHOD USING SCANNER, IMAGE READING SYSTEM, AND IMAGE FORMING APPARATUS

摘要

A color conversion method according to the present invention, in which a scanner that outputs a first color value of a device-dependent color space is used, includes the steps of: acquiring the first color value by reading, by the scanner, a printed material which is based on image data composed of C, M, Y, K values; converting the acquired first color value to a second color value using a scanner profile of the scanner; mapping the first color value acquired from the printed material to the K value of the image data of the printed material; determining a correction quantity of the second color value from the mapped first color value and the K value using a scanner profile correcting LUT; and correcting the converted second color value using the determined correction quantity of the second color value, and outputting the second color value after being corrected.

主权项

1. A color conversion method in which a scanner that outputs a first color value of a device-dependent color space by reading a printed material is used to output a second color value of a device-independent color space, the method comprising the steps of:
acquiring a first color value by reading, by the scanner, a printed material which is based on image data composed of C, M, Y, K values; converting the acquired first color value to a second color value using a scanner profile of the scanner that with the first color value being an input, describes the second color value with respect to the input; mapping the first color value acquired from the printed material to the K value of the image data of the printed material; determining a correction quantity of the second color value from the mapped first color value and the K value using a scanner profile correcting LUT that with the first color value and the K value being an input, describes the correction quantity of the second color value with respect to the input; and correcting the converted second color value using the determined correction quantity of the second color value, and outputting the second color value after being corrected.