Process for converting high resolution data into lower resolution data

A process for mapping high resolution data into lower resolution data involves the use of a hysteresis loop. A transparent digitizer (22) is disposed above a liquid crystal display (24). As an operator writes on the digitizer (22) with a stylus (26), the writing is digitized to form high resolution data which is converted to lower resolution data utilized to operate the display (24). Distortion resulting from the conversion is minimized by using a hysteresis loop concept wherein change of the lower resolution data is prevented unless there is at least a given minimum change in the high resolution data, the value of the lower resolution data also depending on whether the high resolution data is increasing or decreasing in value.