A print color predicting apparatus comprising: a sample data acquirer for acquiring first spectral reflectances of at least three types of sample prints (402, 404, 406, 408), each type being composed of an area colored in a color different from the other types, the sample prints (402, 404, 406, 408) being provided on the same print medium by a given printing process, and second spectral reflectances of the at least three types of sample prints (402, 404, 406, 408), which are covered with the same protective film; an operator selecting a plurality of pairs of sample prints' types from the at least three different types of sample prints; wherein at least three types of sample prints include a black sample print and each of the pairs includes the black sample print; an optical property value estimator for estimating at least two sets of optical property values (410, 412, 414) of the protective film, each corresponding to the first spectral reflectance of the non black sample print of each pair, from a relationship based on the Kubelka-Munk model applied to each of the pairs, using the first spectral reflectances and the second spectral reflectances acquired by the sample data acquirer; such that the optical property values (410, 412, 414) of the protective film are handled as functions of the first spectral reflectance of a print on which the protective film is applied; a data acquirer for acquiring a spectral reflectance of a print (38, 38c), which is provided on the same type of print medium; and a spectral reflectance predictor for predicting a spectral reflectance of a protective-film-covered print, which is the print (38, 38c) covered with the same type of protective film, using the spectral reflectance of the print (38, 38c) acquired by the data acquirer and an estimation of the optical property values of the protective film corresponding to the acquired spectral reflectance based on a predetermined mathematical model applied to the at least two sets of optical property values (410, 412, 414) of the protective film estimated by the optical property value estimator. a sample data acquirer for acquiring first spectral reflectances of at least three types of sample prints (402, 404, 406, 408), each type being composed of an area colored in a color different from the other types, the sample prints (402, 404, 406, 408) being provided on the same print medium by a given printing process, and second spectral reflectances of the at least three types of sample prints (402, 404, 406, 408), which are covered with the same protective film; an operator selecting a plurality of pairs of sample prints' types from the at least three different types of sample prints; wherein at least three types of sample prints include a black sample print and each of the pairs includes the black sample print; an optical property value estimator for estimating at least two sets of optical property values (410, 412, 414) of the protective film, each corresponding to the first spectral reflectance of the non black sample print of each pair, from a relationship based on the Kubelka-Munk model applied to each of the pairs, using the first spectral reflectances and the second spectral reflectances acquired by the sample data acquirer; such that the optical property values (410, 412, 414) of the protective film are handled as functions of the first spectral reflectance of a print on which the protective film is applied; a data acquirer for acquiring a spectral reflectance of a print (38, 38c), which is provided on the same type of print medium; and a spectral reflectance predictor for predicting a spectral reflectance of a protective-film-covered print, which is the print (38, 38c) covered with the same type of protective film, using the spectral reflectance of the print (38, 38c) acquired by the data acquirer and an estimation of the optical property values of the protective film corresponding to the acquired spectral reflectance based on a predetermined mathematical model applied to the at least two sets of optical property values (410, 412, 414) of the protective film estimated by the optical property value estimator.