Provided are a processor device, an endoscope system, and an image processing method capable of discovering not only a lesion in which scattering particles according to a specific scattering model are present but also various lesions. A processor device 16 includes an image acquisition unit 54 that acquires images of three wavelength ranges of a blue wavelength range, a green wavelength range, and a red wavelength range a scattering characteristic amount calculation unit 71 that calculates a scattering characteristic amount representing a scattering characteristic of an observation object, using the images of the three wavelength ranges and an image generation unit 74 that generates a scattering characteristic amount image representing a distribution of the scattering characteristic amount.
