For the past forty years, light-lens copiers have been the dominant form of xerographic imaging. However, recent rapid progress in digital software and hardware has now enabled xerographic imaging to evolve to a digitally-based printing technology for both full-color and black-and-white applications. As a result, many of the limitations imposed by light-lens imaging have now been removed via digital software applications in areas such as image processing and process control. From a marking materials viewpoint, however, many of the opportunities and challenges posed by digital imaging are yet to be addressed, since current xerographic toners and carriers are still largely based on design concepts that were developed for the mature technology of light-lens imaging.