Patent ID: 7283239

Claim:
A method comprising the steps of: an image generation step for generating a brightness image of a paint film containing a glittering material based on a light that is irradiated to and reflected by the paint film, a glitter representing value calculation step for calculating a glitter representing value that represents properties of the brightness image generated at the image generation step, a color value acquisition step acquiring color values of the reflected light in one or more predetermined light-receiving angles, colorimetry of the reflected light being separately performed, a visual evaluation value acquisition step for acquiring a visual evaluation value of the mottling of the paint film, the visual evaluation being separately carried out, a calculation formula generating step for generating a mottling calculation formula of the paint film based on the glitter representing value calculated at the glitter representing value calculation step, the color values acquired at the color value acquisition step, and the visual evaluation value acquired at the visual evaluation value acquisition step, an evaluation step for numerically evaluating mottling of other paint film using the generated mottling value calculation formula, and an output step for outputting a result of the evaluation step to a user.