Note that, in the present embodiment, a prediction target color setting step is achieved by Step S200, a first relational equation calculation step is achieved by Step S210, a first prediction step is achieved by Step S220, a difference value calculation step is achieved by Step S230, a reference color selection step is achieved by Step S240, a union creation step is achieved by Step S250, a third prediction step is achieved by Step S260, a second relational equation calculation step is achieved by Step S270, and a second prediction step is achieved by Step S280 and Step S290. Moreover, a second relational equation using step is achieved by Step S280, and an interpolation step is achieved by Step S290.
<3.3 Effect>
According to the present embodiment, an effect similar to those of the above-described first embodiment and the above-described second embodiment can be obtained. Further, use of the union can suppress the process of the spectral reflectance predictions program 141 from being complicated.
<4. Others>