1. A photoacoustic imaging device, comprising: a light emitting section that emits a measuring light beam into the body of a subject; an electroacoustic converting section that detects photoacoustic waves, which are generated within the body of the subject by the measuring light beam being irradiated thereon, and converts the photoacoustic waves into electrical signals; an image generating section that generates a photoacoustic image based on the electrical signals; and an extracting section that extracts position data regarding the positions of each of a plurality of peaks in the electrical signals that the photoacoustic waves have been converted into, and positive/negative data that indicates whether the peaks are positive or negative; the image generating section administering chromatic adjustments to an image region corresponding to a signal region sandwiched between a pair of adjacent peaks based on the position data of the peaks in the case that the positive/negative data for the pair of adjacent peaks from among the plurality of peaks are in the order of positive then negative in temporal series, as a correction process that facilitates discrimination of the pair of adjacent peaks and the signal region as being a single tissue system.