Abstract: Groups (e.g. 3) of parallel digital video input signals having a first frequency are provided, each group having a first number (e.g. 8) of binary bits. The parallel signals in each group correspond in gray scale to the signals providing one of the colors in a single color pixel. The parallel signals may have a first particular frequency. The parallel digital signals are serialized at a second frequency constituting an integral multiple (e.g. 3) of the frequency of the parallel signals. The serialized signals are converted in a look-up table to serialized signals having the second frequency. The number of bits in each group of the signals from the look-up table have an arbitrary relationship to the number of the binary bits in each group introduced to the look-up table. For example, the number of binary bits in each group from the look-up table may be ten (10). The signals from the look-up table are converted to analog signals which produce a gray scale image on a monitor face.