Image processing apparatus for and a method of preparing data re

Details Image processing apparatus for and a method of preparing data re Image processing apparatus for and a method of preparing data re

1997-03-27

1998-06-09

Stoll, Thomas L.

Image analysis

Color image processing

Color correction

358518, 358504, 358515, G03F 308

Patent

active

057647968

ABSTRACT:
An image processing apparatus (1) comprises a color image scanner (2) for producing digital data defining pixels representing an image in terms of cyan (C), magenta (M), yellow (Y) and black (K) components. The CMYK data from the scanner is received by a conversion processor (5) and a color converter (6). The color converter (6) together with a format converter (7) converts the CMYK data into RGB data, representing the image in terms of its red, green and blue components, for processing by a drawing processor (9). The operation of the scanner (2) is adjustable to a desired setting to provide CMYK data to which a color correction has been applied. In order that the RGB data accurately represents the color content of the image the effect of the color correction must be removed. This is achieved by scanning an image of a grey scale with the scanner (2) set to a reference setting and set to the desired setting to obtain two sets of CMYK data which are analyzed by the conversion processor (5) to determine a relationship therebetween. With this information the conversion processor (5) calculates conversion parameters for use by the color converter (6).

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