Medium overlays

PSF positions a medium overlay at the media origin. The medium origin is constant throughout a document, but is printer-dependant.⁴ Thus, a medium overlay is positioned at the same place on each page on which it is printed. You can print medium overlay data in different locations on different pages in these ways:

• Create different versions of a medium overlay.
• Use different medium maps to position the same medium overlay in different positions.

Figure 12 shows the positioning of a medium overlay.

Figure 12. Positioning of a medium overlay. The overlay is positioned at the medium origin.

As Figure 12 shows, the size of a medium overlay is generally the same as the page size. In this example, the positioning information in the overlay causes PSF to print the data in the overlay at the bottom of the page. You can control the size of a medium overlay; for example, the OGL OFFSET parameter increases the total size of the compiled overlay resource and offsets the overlay data within the expanded overlay boundaries.