An image processing apparatus for color converting an input image signal to an output image signal includes a multidimensional look-up table and a judgment unit. The multidimensional look-up table correlates a signal value of the output image signal corresponding to a signal value of the input image signal with a position on a coordinate axis in a predetermined color space and holds it, secures a holding area for holding a specific color signal value in an area on the coordinate axis, the area is not taken by the signal value of the input image signal. The judgment unit judges whether the signal value of the input image signal is a specific color or not. When the input image signal is the specific color, address conversion is performed on the input image signal, and the specific color signal value in the holding area is acquired based on the multidimensional look-up table.