1. An inkjet imaging system that compensates for changes in drop velocity in inkjet ejectors, the system comprising: a printhead having inkjet ejectors configured to eject ink onto an image receiving member in response to firing signals; a memory in which at least one structured dash is stored for each inkjet ejector in the printhead; and a controller electrically coupled to the printhead and to the memory, the controller being configured to adjust image data used to generate firing signals for an inkjet ejector in a printhead of an inkjet imaging device by substituting the at least one structured dash pattern stored in the memory for the inkjet ejector for an image data pattern within image data to be printed by the inkjet ejector, the at least one structured dash pattern being configured to operate the inkjet ejector only non-continuously over a predetermined number of pixels that is greater than one and the image data pattern in the image data being configured to operate the inkjet ejector only continuously over the predetermined number of pixels that is greater than one, and generating the firing signals for the inkjet ejector with reference to the image data adjusted with the at least one structured dash pattern.