HP 4050 HP PCL/PJL reference - PCL 5 Comparison Guide - Page 72
Pixel Placement Command, Grid Inter Model
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Note Pixel Placement Command This command determines how pixels are rendered in images. ?*l # R # = 0 - Grid intersection 1 - Grid centered Default = 0 Range = 0, 1 (command is ignored for other values) Two models are used for rendering pixels when an image is placed on paper: • Grid Intersection Model • Grid Centered Model This command can be invoked multiple times during a page. It has no effect except to switch the model being used for imaging. The PCL Pixel Placement command determines how pixels are placed for both PCL and HP-GL/2 operation. 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.) 2-24 Printer-Specific Differences ENWW