A first conversion table defines a plurality of grid points that are arranged in a predetermined color space. The grid points include a darkest grid point that is indicative of a darkest point among all the grid points. The grid points further include at least (N+1) number of grid points that are successively arranged in a predetermined direction from the darkest grid point, N being an integer greater than or equal to one (1), the grid points including an N-th grid point and an (N+1)-th grid point that are located N-th and (N+1)-th among the at least (N+1) number of grid points, respectively. The first conversion table lists up an intermediate-component-value combination at each grid point, the intermediate-component-value combination, at least one grid point that is located between the darkest grid point and the (N+1)-th grid point in the predetermined direction and that includes the N-th grid point, being determined through interpolation based on the intermediate-component-value combination at the darkest grid point and on the intermediate-component-value combination at the (N+1)-th grid point.