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5-4 The PCL Print Model EN
Figure 5-3 demonstrates the transparency modes. In the first example
(1a), the transparency mode for both the source image and the
pattern is transparent. Since the source mode is “transparent,” only
the non-white region (the circle) of the source image is overlaid on the
destination. Since the pattern mode is also transparent, the patterned
source image is applied only to the white areas of the destination.
In the second example (1b), the source mode is still “transparent,” but
the pattern mode is “opaque” – so the pattern's white pixels are
applied to the destination. The resulting image shows the entire circle
region visible and patterned.
In the third example (1c), the source mode is “opaque” and the
pattern mode is transparent. Since the source mode is opaque, the
entire source image (the circle and the surrounding square) appears
overlaid onto the destination. The pattern, however, is allowed to pour
through only onto the white-pixeled area of the destination. The circle
is visible in the result, but only two opposing quarters appear
patterned.
In the fourth example (1d), both source and pattern modes are
“opaque.” The entire source image is overlaid onto the destination,
and the entire circle is patterned.