| 摘要 |
A colored image reading apparatus in which the light-intensity signals produced in response to the red, green and blue color components of the light carrying the image information pickup up from a given document sheet bearing multi-colored images are converted into quantity-of-ink data signals indicating the quantities of cyanic-, magenta- and yellow-colored inks to be used for the formation of colored pixels, wherein the conversion of the color-density signals into the quantity-of-ink data signals is effected by a conversion table into which are stored quantity-of-ink data produced through mathematic calculation involving logarithmic conversion of variable values which are generated as the products of multiplication between a set of fixed parameters and numerical values respectively representing the color densities indicated by the light-intensity signals. The set of parameters is selected from among a plurality of sets of parameters including optional sets of parameters and a standard set of parameters. Any of the plurality of optional sets of parameters may be selected either manually by the operator or through preliminary detection of the predominant color used in the original multi-color images. The standard set of paremeters is selected for use when none of the optional sets of parameters is selected. The color image reading apparatus of the present invention permits naturally colored images to be reproduced accurately.
|
