Patent ID: 8780350

Claim:
A method of manufacturing an article having anodized alumina on a surface thereof, comprising: irradiating a surface of the article having anodized alumina with a structure having two or more pores in which a pore interval is less than or equal to a wavelength of visible light on the surface thereof and reflecting colored light, with light from an illumination device after the anodized alumina is formed; capturing an image of reflected colored light from the surface of the article having anodized alumina on the surface using an imaging device; acquiring color information from an image captured by the imaging device; and inspecting a shape of the pore of the article having anodized alumina on the surface based on the color information, wherein in the capturing the image of the reflected colored light from the surface of the article having anodized alumina on the surface using the imaging device, the imaging device having an optical axis at an angle of 45 to 89.9 degrees with respect to a normal line of the surface of anodized alumina.