A control device of a projection apparatus that projects an image from a display portion displaying the image based on input image data to a projection object through an optical system, includes: a correction portion that corrects the input image data by performing first processing of increasing pixel values of pixels of the input image data corresponding to a specific region determined by a light quantity distribution in a surface of the projection object in the image projected to the projection object, and second processing of uniformly decreasing each of pixel values of pixels of the input image data by a first pixel amount.