| 摘要 |
PURPOSE:To maintain the saturation of chromatic colors even when under color elimination is executed by correcting the yellow, magenta, and cyan signals of a part where under color is not eliminated corresponding to the quantity of black signals. CONSTITUTION:The minimum value signals MIN of respective signal of yellow, magneta, syan Y1, M1, C1 are detected by a minimum value detection circuit 1, and a black component arithmetic circuit 5 obtains a black signal K1. Subtraction circuits 2-4 respectively subtract the signals MIN from the signals Y1, M1, C1 and make them signals Y2, M2, C2, and inputs them to correction circuits 10-12. In the meantime, the signal K1 is inputted to correction value output circuits 6-8 from which correction parameters Ycp, Mcp, Ccp which increase the quantity of switable chroma are outputted, and the parameters are inputted to the circuits 10-12. Accordingly, the circuits 10-12 outputs correction values Y3, M3, C3 after a prescribed operation. Adding circuits 13-15 adds the output X of a subtraction circuit 9 that subtracts the signal K1 from the signal MIN to these correction values, and thus generates signals Y4, M4, C4 after the under color elimination. These signals Y4, M4, C4 are such signals that the quantities of themselves in the maximum value and the intermediate value after the under color elimination are increased, hence the reduction of the chroma is made small.
|
