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Logical
Operations
The basic print model defines how a pattern, source image,
and destination image are applied to each other using the
print model’s transparent and opaque modes to produce a
resulting image. The Logical Operations (?*l #O) command
specifies which logical operation is to be performed on
the source, texture, and destination to produce a new desti-
nation. Transparency modes should be specified before the
logical operation is performed or printable data is sent.
The print model process consists of the following steps:
1. Specify source and/or pattern transparency modes, if
desired.
2. Specify the logical operation (or use the default).
3. Define the desired operands (source, destination, pat-
tern).
Definitions
Source: The source image may be one of the following:
HP-GL/2 primitives
Rules
Characters
Raster images (single plane mask or multiplane color)
Destination: The destination image contains whatever is
currently defined on the page. It includes any images
placed through previous operations.
Pattern or Texture: The pattern is defined by the Select
Current Pattern command (?*v#T). The terms pattern and
texture are used interchangeably in this section.
The PCL Print Model 5-9The PCL Print Model 5-9