According to one embodiment, an inkjet printer includes an inkjet head for discharging each of a plurality of visible color inks onto a medium and discharging at least one fluorescent ink onto only portions of the medium when printing an image onto the medium, such that at least a first visible color ink of the plurality of visible color inks is discharged onto the portions of the medium, and at least a second visible color ink of the plurality of visible color inks is not discharged onto the portions of the medium. The plurality of visible color inks reflect light at respective wavelength ranges of the visible color inks. The at least one fluorescent ink reflects light at a wavelength range that is the same as a wavelength range of at least one of the plurality of visible color inks discharged from the inkjet head.