1. A method for processing image data for presentation by a printing device of an image that depicts an object in front of a background, wherein the method comprises: obtaining a rendition value for a target pixel that represents the object and is adjacent to a background pixel that represents only the background, wherein the rendition value represents a degree to which the target pixel represents the object; determining a first position value that represents a position of a subpixel within the target pixel, wherein the determination is based on the target pixel's location with respect to a second pixel that represents the object and is adjacent to the target pixel; and determining a second position value that represents a position of a subpixel within the second pixel, wherein the determination is based on the second pixel's location with respect to the target pixel.