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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 se-
lected by the Pattern ID command (?*c#G) and the Fill Rec-
tangular 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.
The PCL Print Model 5-49The PCL Print Model 5-49