Color image reader

Abstract

Abstract PURPOSE:To reduce the hue difference of specified color in an original by providing a non-volatile memory to hold a constant about ink quantity and an arithmetic operating means which forms the ink quantity by using the combination of the constants read from said memory and supplies it to a color/ink quantity conversion table. CONSTITUTION:In the re-scanning of the original, a color signal to show the light intensity of a specified wavelength in reflected light is detected by an image sensor 28, and is formed by letting pass through A/D converters 33 to 3, 5, shading circuits 36 to 38 under the control of a CPU 30, and a principal color range is determined. A ROM 50 holds previously the combination of the constants to set the information of the ink quantity so that the hue difference between prescribed color expressed by the color signal and the color sample of uniform space becomes smaller than the hue difference related to other color as keeping it corresponding to the prescribed colors different from each other. The CPU 30 operates the information related to the ink quantity on the basis of the read out combination of the constants, end supplies it to the conversion table (RAMs 40 to 42 and an adder 43) of a color masking circuit 39. If the image is printed according to this ink quantity, the hue difference never occurs.

Inventors

• 👤 Shigeru Moriya
• 👤 茂 守家

Bibliographic Details