a method and apparatus for employing print mode techniques to optimize image quality , throughput speed and reliability , including generating pseudo - random printmasks to minimize banding , bleeding , blocking , and other undesirable printing artifacts , and combining random selection of a pass number for printing each pixel of a printmask with application of various constraints . in combination with other aspects of the invention , speed is optimized by depositing substantially a single drop of ink per pixel , thereby minimizing both the number of passes required to render all pixels completely and drying time . image quality is optimized by maximizing the time and distance between deposition of individual ink drops , thereby minimizing coalescence , bleeding , cockling , blocking , pen temperature , and pen - firing frequency which affect uniformity and consistency of ink drop size . reliability and durability are optimized by maintaining pen - firing frequency and carriage velocity below maximum limits set by manufacturers thereof .