1. A control device for causing a print performing unit to perform a print, the print performing unit including a print head on which a plurality of image forming elements is formed, the control device comprising: one or more processors; and a memory that stores a computer program including instructions executed by the one or more processors, wherein the instructions cause the one or more processors, when executed by the one or more processors, to function as: a first generating unit configured to generate a first type of processed image data by executing a first type of image process on target image data of a process target in accordance with an error diffusion method using a first error diffusion matrix; and a supplying unit configured to supply the first type of processed image data to the print performing unit in a case where the first type of processed image data is generated, wherein the first generating unit includes a compensating unit configured to execute a compensation process on a target pixel within the target image data for compensating variability of outputs of the plurality of the image forming elements, by using correcting data for a target image forming element which is to form an image at a position corresponding to the target pixel on the print medium, the correcting data is data acquired by using a value equivalent to a value calculated by multiplying a first coefficient by a first difference which is a difference between a target value and a first value, the target value is acquired by using characteristic data corresponding to the target image forming element, the first value is acquired by using characteristic data corresponding to a first image forming element within the plurality of image forming elements, the first image forming element is an image forming element which is to form a first neighbor raster neighboring a target raster formed on the print medium by the target image forming element, the first image forming element is an image forming element which is to form an image at a position corresponding to a first pixel on print medium, the first pixel being a pixel for which an error value is calculated before the target pixel, the characteristic data is data related to an output of an image forming element corresponding to the characteristic data, the first error diffusion matrix indicates M1 (M1 equal to or more than 2) pieces of error diffusion coefficients corresponding to M1 pieces of peripheral pixels positioned at the periphery of the target pixel, the first coefficient is decided based on a ratio between a summation of the M1 pieces of error diffusion coefficients and a summation of M2 (M2 less than M1) pieces of error diffusion coefficients corresponding to M2 pieces of peripheral pixels within the M1 pieces of peripheral pixels, and the M2 pieces of peripheral pixels are included in one or more rows other than a row including the target pixel.