Image data processing methods, hard imaging devices, and processor usable media

Image data processing methods, hard imaging devices (10), and processor usable media are described. According to one embodiment, an image data processing method includes accessing image data of an image and comprising a plurality of pixels (40), defining a plurality of subsets (32) of the pixels (40), defining an overlapping region (42) comprising image data of pixels (40) located adjacent to a boundary (34) intermediate one and an other of the subsets (32), independently processing the image data of the one and the other of the subsets (32) individually comprising comparing the image data for respective ones of the pixels (40) with a plurality of thresholds corresponding to respective ones of the pixels (40), and modulating the thresholds of the pixels (40) of the overlapping region (42) using a common modulation pattern for both the processing of the one and the other subsets (32). Some embodiments relate to halftone processing using error diffusion.