A control device includes a processor. The processor is configured to: acquire a first colorimetric value of light of a first color that is an adjustment color and is projected from a first projection device; acquire a second colorimetric value of light of the first color that is projected from a second projection device; and determine a first color adjustment parameter for bringing a position of the first colorimetric value in a specific color space closer to a position of the second colorimetric value in the specific color space based on adjustment data for the first color, the first colorimetric value, and the second colorimetric value, the adjustment data indicating a relationship between a color adjustment parameter and the position in the specific color space.