A unit acquires first image data expressing a color of an image and second image data expressing a feature of the image. A unit color-separates the first image data into first and second color material amount data. A unit generates inverted data by inverting the second image data. A unit generates first corrected data from the first color material amount data and the inverted data and generates second corrected data from the second color material amount data and the second image data. A unit generates, based on the first corrected data, first data indicating on dot printing positions during a printing and scanning operation, generates, based on the second corrected data, second data indicating on dot printing positions in the operation, and generates, based on the first and second data, image forming data.

A unit acquires first image data expressing a color of an image and second image data expressing a feature of the image. A unit color-separates the first image data into first and second color material amount data. A unit generates inverted data by inverting the second image data. A unit generates first corrected data from the first color material amount data and the inverted data and generates second corrected data from the second color material amount data and the second image data. A unit generates, based on the first corrected data, first data indicating on dot printing positions during a printing and scanning operation, generates, based on the second corrected data, second data indicating on dot printing positions in the operation, and generates, based on the first and second data, image forming data.

An information processing system includes a processor configured to: perform a weighting operation to weight, about image data on white pixels and color pixels, color pixels surrounding a pixel of interest within a predetermined region in a manner such that a lower weight is attached to each of the color pixels as the color pixel is farther from the pixel of interest; and correct the pixel of interest if a sum of weights of the color pixels surrounding the pixel of interest is lower than a threshold.

A print data generating apparatus executes color conversion on image data using a color conversion profile to generate print data. In the color conversion profile, each of a plurality of sets of specific color data defined in a specific color space are associated with a set of first ink color data defined in an ink color space. A part of the plurality of sets of specific color data are further associated with a set of second ink color data defined in the ink color space. In bi-directional printing, a print executing unit uses the first ink color data to execute one of forward print and backward print, and uses both the first ink color data and the second ink color data to execute another of forward print and backward print.