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5-50 The PCL Print Model EN
Pattern Transparency for Rectangular Area Fill
Pattern transparency affects how a pattern is applied to the
rectangular fill area. The pattern and pattern type are selected by the
Pattern ID command (
?*c#G) and the Fill Rectangular Area (?*c#P)
command (described earlier in this chapter).
Note Source transparency has no effect on the rectangular fill area since
the rectangular area is viewed as all 1’s (a solid black source image).
When applying a pattern (area fill) to the rectangular area, the pattern
transparency mode affects the final result the same as it does when
filling other images or text. The pattern transparency mode
determines the effect white pixels of the pattern have on the
destination for value fields 0 (black fill), 2 (shaded fill), 3 (cross-hatch
fill), or 5 (current pattern fill) of the Fill Rectangular Area command.
The “0'' bits of the fill pattern are either applied (opaque) or ignored
(transparent) based on the transparency mode setting (see
Figure 5-12). When a value field of 1 (white fill) is used, pattern
transparency mode is always treated as if it were opaque.
The effect of transparency modes on rectangular areas is illustrated
in Figure 5-12. In both examples, the source transparency mode is
opaque regardless of the actual setting. In the first example, the
pattern transparency mode is transparent; the white pixels in the
pattern are not applied to the destination, so that the pattern is visible
in only two quadrants of the destination. In the second example, the
pattern transparency mode is opaque, and the pattern is visible in the
entire rectangular area.