Patent ID: 6693731
Filing Date: 2004-02-17
Classification: H04N

Abstract:
An image processing apparatus for performing a color correction process and a color conversion in process, comprising:color correcting means for inputting color image signals (R, G, B), performing a series of color correction processes, and outputting color image signals (Râ€², Gâ€², Bâ€²); first equal signal detecting means for detecting whether the constituents of said input color image signals are equal; second equal signal detecting means for detecting whether the constituent of said output color image signals from said color correcting means are equal; equal signal generating means for changing the output signals from said color correcting means to generate equal signals; different signal generating means for changing the output signals from said color correcting means to generate different signals; first selecting means for selecting the output signals from said different signal generating means if said second equal signal detecting means judges that the output signals from said color correcting means are equal, and if not, selecting the output signals from said color correcting means; second selecting means for selecting the output signals from said equal signal generating means if the input signals are judged as equal, and if not, selecting the output signals from said first selecting means; color converting means for inputting the output signals from said second selecting means, performing a series of color conversion processes, and outputting color image signals (C, M, Y, K); black replacing means for inputting the output signals from said color converting means and replacing the values of the output signals by C=M=Y=0 and K; third equal signal detecting means for detecting whether the constituents of the output signals from said second selecting means are equal; and third selecting means for selecting the output signals from said black replacing means if the input signals from said second selecting means are judged as equal, and if not, selecting the output signals from said color converting means.