1. A projection-type display device comprising: an image projection unit which projects an image; an image quality adjustment unit which adjusts an image quality of the image to a color mode included in a plurality of color modes enabled to be set according to an environment at the time of projection; a focus adjustment unit which performs focus adjustment of the image; and a control unit which when performing the focus adjustment of the image, performs image quality control to set the image quality of the image projected by the image projection unit to a relatively high-contrast sense color mode included in the plurality of color modes, and performs image quality control to restore the image quality of the image to the color mode immediately preceding the performing of the focus adjustment of the image, wherein each of the plurality of color modes includes data describing a value of each of a plurality of image quality parameters, the plurality of image quality parameters comprising brightness, contrast, and sharpness, and wherein the relatively high-contrast sense color mode comprises a color mode included in the plurality of color modes having a value of at least one of the plurality of image quality parameters that is higher than a value of the at least one of the image quality parameters of at least one of the other color modes included in the plurality of color modes.