Method and apparatus for digital out of a maskiervorganges in the case of an image reproducible machine

摘要

PURPOSE:To perform digital color tone control easily and securely, by indexing the memory table corresponding to each term of a masking equation by the digital separation color data of corresponding variables, and calculating the total amount. CONSTITUTION:Memory tables 40-42Y corresponding to each term of a higher order masking equation I are read out by data Y1, M1, C1 of plate making yellow, magenta and cyan colors corresponding to the chromatic color data separated from the image color data by scanning of the original picture. These read-out data are added and processed through buffers 54-56, adder 57, latch circuit 60 and buffer 61, and masking digital operation corresponding to yellow color is performed in the latch circuit 43Y, and masking corrected yellow color data Y2' is obtained. Magenta and cyan data are similarly processed by digital operation easily by changing the table writing, so that the color tone may be controlled easily and securely without using switch elements. In the equation, ay1... refer to masking coefficients.