1. A method for creating an image to be printed, comprising: selecting a first halftone pattern for a first periodic clustered dot halftone region of the image to be printed wherein the first periodic clustered dot halftone region has a first frequency; selecting a second halftone pattern for a second periodic clustered dot halftone region of the image to be printed wherein the second periodic clustered dot halftone region has a second frequency and wherein one of the frequencies is higher than the other frequency; determining a transition region that includes a boundary between the two halftone regions and includes additional portions of the two halftone regions beyond the boundary, wherein the additional portions are respective subsets of each of the two halftone regions and wherein a fixed width is used for the entire transition region; and blending the two halftone patterns with each other in the transition region based on a blending ratio of the two halftone patterns that changes as a function of distance between the edges of the transition region, wherein the selecting of the first and second halftone patterns, the determining and the blending are performed by one or more computer processors and wherein the blending of the two halftone patterns further comprises: controlling a strength of the blending ratio based on an angle between the boundary and a screen vector associated with a respective region.