In one example, halftone data comprising first data and second data representing a plurality of pixels in a halftone is generated. The first data associates a first subset of the plurality of pixels in the halftone with a first colorant, the first subset defining a first region in the halftone. The second data associates a second subset of the plurality of pixels in the halftone with a second colorant different from the first colorant, the second subset defining a second region in the halftone. The first subset of the plurality of pixels in the halftone and the second subset of the plurality of pixels in the halftone are mutually exclusive, and the first region is at least partially enclosed by the second region.