1. A measuring apparatus comprising: an illumination optical system that radiates excitation light coming from an excitation light source onto a specimen; an image acquisition portion that acquires an image by measuring light generated at the specimen; and an image processing portion that, based on a first image, which is acquired by the image acquisition portion without radiating the excitation light, and a second image, which is acquired by the image acquisition portion while radiating the excitation light, generates a fluorescence image by removing a luminescence component from the second image.