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Transparency Modes: The white pixels of the source
and/or pattern may be made transparent (source
transparency 0, pattern transparency 0). The destination
shows through these areas. Transparency modes are set by
the Source Transparency (?*v#N) and Pattern
Transparency (?*v#O) commands.
The Print Model allows logical operations, such as AND,
OR, XOR, NOT, to be performed on source, texture, and
destination images. Transparency modes and Logical
Operation must be specified before printable data is sent.
Operators
Source Transparency (specified before logical operation;
default is transparent)
Pattern Transparency (specified before logical operation;
default is transparent)
Logical Operators (default is Texture OR Source)
Operands
Source objects: character cell, raster image, rule,
HP-GL/2 vectors and polygons
Texture: foreground color + pattern mask, color pattern
(format 1).
Destination: current page definition
Operation
IF (source transparent && source == white) RETURN
destination
IF (pattern transparent && pattern == white) RETURN
destination
ELSE RETURN (logical op (source, texture, destination)
Assuming three bits per pixel, the following diagram shows
the process.
5-10 The PCL Print Model5-10 The PCL Print Model