1. An image processing device comprising: a first image acquisition section that acquires a first image, the first image being a color image that includes a plurality of channels, and includes an object image including information within a wavelength band of white light; a second image acquisition section that acquires a second image, the second image being an image that includes an object image including information within a specific wavelength band, and differs from the plurality of channels included in the first image; a candidate attention area detection section that detects a candidate attention area based on a feature quantity of each pixel within the second image, the candidate attention area being a candidate for an attention area; a reliability calculation section that calculates reliability that indicates a likelihood that the candidate attention area detected by the candidate attention area detection section is the attention area; and a display mode setting section that performs a display mode setting process that sets a display mode of an output image corresponding to the reliability calculated by the reliability calculation section.