HP L 5 manual Logical Operations, Definitions

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 destination. 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:

1Specify source and/or pattern transparency modes, if desired.

2Specify the logical operation (or use the default).

3Define the desired operands (source, destination, pattern).

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.

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.

EN The PCL Print Model 5-9