1. An image processing apparatus comprising a controller configured to perform: acquiring image data representing an image and including first component image data and second component image data, the first component image data representing a first component image including a plurality of pixels each having a gradation value of a first color component, the second component image data representing a second component image including a plurality of pixels each having a gradation value of a second color component; adjusting the first component image data to generate adjusted first component image data, the adjusted first component image data representing an adjusted first component image including a plurality of pixels each having a gradation value of the first color component, a pixel count in a first direction of the adjusted first component image being determinative of a first resolution, the adjusted first component image data being generated by: selecting a first target pixel from the plurality of pixels in the adjusted first component image; acquiring gradation values of first correspondence pixels, the first correspondence pixels being at least two of the plurality of pixels in the first component image that are overlapped by the first target pixel when the first component image is shifted a first distance in the first direction relative to the adjusted first component image and superimposed in the adjusted first component image under assumed conditions (a)-(d): (a) a dimension of the first component image in the first direction is identical to a dimension of the adjusted first component image in the first direction; (b) a dimension of the first component image in the second direction is identical to a dimension of the adjusted first component image in the second direction; (c) the plurality of pixels in the first component image is arranged in a grid form, each pixel in the first component image having a first height in the first direction and a first width in the second direction, the first height being determined on a basis of a pixel count in the first direction of the first component image, the first width being determined on a basis of a pixel count in the second direction of the first component image; and (d) the plurality of pixels in the adjusted first component image is arranged in a grid form, each pixel in the adjusted first component image having a second height in the first direction and a second width in the second direction, the second height being determined on a basis of the pixel count in the first direction of the adjusted first component image, the second width being determined on a basis of a pixel count in the second direction of the adjusted first component image; and determining a gradation value of the first target pixel on a basis of gradation values of the first correspondence pixels; adjusting the second component image data to generate adjusted second component image data, the adjusted second component image data representing an adjusted second component image including a plurality of pixels each having a gradation value of the second color component, a pixel count in the first direction of the adjusted second component image being determinative of a second resolution lower than the first resolution, the adjusted second component image data being generated by: selecting a second target pixel from the plurality of pixels in the adjusted second component image; acquiring gradation values of second correspondence pixels, the second correspondence pixels being at least two of the plurality of pixels in the second component image that are overlapped by the second target pixel when the second component image is shifted a second distance in the first direction relative to the adjusted second component image and superimposed in the adjusted second component image under assumed conditions (e)-(h): (e) a dimension of the second component image in the first direction is identical to a dimension of the adjusted second component image in the first direction; (f) a dimension of the second component image in the second direction is identical to a dimension of the adjusted second component image in the second direction; (g) the plurality of pixels in the second component image is arranged in a grid form, each pixel in the second component image having a third height in the first direction and a third width in the second direction, the third height being determined on a basis of a pixel count in the first direction of the second component image, the third width being determined on a basis of a pixel count in the second direction of the second component image; and (h) the plurality of pixels in the adjusted second component image is arranged in a grid form, each pixel in the adjusted second component image having a fourth height in the first direction and a fourth width in the second direction, the fourth height being determined on a basis of the pixel count in the first direction of the adjusted second component image, the fourth width being determined on a basis of a pixel count in the second direction of the adjusted second component image; and determining a gradation value of the second target pixel on a basis of gradation values of the second correspondence pixels; and generating adjusted image data based on the adjusted first component image data and adjusted second component image data.