HP Deskjet Figure 2-1.Pixel Placement

The example shown in Figure 2-1 illustrates the concepts of the two models. Assume a rectangle extends from coordinate position (1,1) to position (3,4). As shown below, each model produces a different result. (Since PCL printers print only at intersections, grid centered pixel placement is implemented as shown on the right.)

Figure 2-1. Pixel Placement

The grid centered model produces a rectangle that is one dot row thinner and one dot row shorter than the grid intersection model. The grid intersection model is the PCL default.

Note The grid centered method is used by Microsoft Windows.

2-26 Printer-Specific Differences