HP PCL/PJL reference - PCL 5 Comparison Guide

ENWW Printer-Specific Differences 2-29
Note When using the MC command, some pattern types will not produce
the expected ROP result. This only occurs when using the FT (Fill
Type) command pattern types 1, 2, 3, and 4, and the ROP includes an
XOR operation. (This problem is due to the fact that these patterns
are the result of a vector operation and do not produce raster data for
use by a ROP operation.) All other Fill Type command patterns
(types, 10, 11, 21, or 22) operate as expected.
opcode
The operation code (opcode) specifies the logical operations that are
performed on a source, destination, and patterned image prior to
drawing the final image. The opcodes are created by listing all
possible combinations of a single pattern, source and destination
pixel, and constructing the desired final pixel values. The following
table shows three common opcodes (also see Table 2-6).
Table 2-3. Common Opcodes
Pixel Combinations Desired Destination Values
Pattern Pixel Source Pixel Destination
Pixel
Source
Overwrite
Transparency
(TR command)
Source
Destination
000000
001011
010111
011110
100000
10 1011
110111
111110
Resulting Opcode 204 (0xCC) 238 (0xEE) 102 (0x66)