HP PCL/PJL reference - PCL 5 Comparison Guide

2-14 Printer-Specific Differences ENWW
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: pattern mask
• Destination: current page definition
Assuming three bits per pixel, the following diagram shows the print
model process.
Note The Logical Operation command (?*l#O) provides 255 possible
logical operations. All of these logic operations map directly to their
ROP3 (raster operation) counterparts (see the Microsoft Document,
Reference, Volume 2, Chapter 11, Binary and Ternary Raster
Operation Codes).
The logical operations were defined by Microsoft Windows for an
RGB color space (a “1” is white and a “0” is black).