| CPC G03G 15/5062 (2013.01) [G03G 15/5016 (2013.01)] | 11 Claims |

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1. An electrophotographic printing system comprising:
circuitry configured to:
select, in accordance with an operation to an input device, a mask pattern made up of first toner representing black by a combination of a plurality of color toners, the mask pattern being overlaid on an image area of a target image to be concealed within image data; and
generate, based on the image data, print data for overlaying and printing the selected mask pattern on the image area.
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