A digital camera includes: an imaging unit that photoelectrically converts light to output a color image; a selecting unit that selects any one identifier from identifiers which are colored in different colors from each other; and a black/white image producing unit that produces a black/white image by weighting gradation values of respective colors for each of pixels of the output color image and adding the weighted gradation values to each other. When the light entered to the imaging unit is entered to a color filter having a color equal to a color of the selected identifier, a correlation between a light amount of light having a wavelength which penetrates the color filer and a light amount of the entered light becomes stronger than a correlation between a light amount of light having a wavelength which is absorbed by the color filter and the light amount of the entered light.