HP PCL/PJL reference - PCL 5 Comparison Guide

ENWW Printer-Specific Differences 2-17
Example:
The Logical Operation default value is 252 (TSo), corresponding to a
logical function of:
(texture | source)
The result is computed below for both case 1 (source and pattern
opaque) and case 4 (source and pattern transparent) on the previous
page. Note that the ROP3 value of 252 results only with case 1, when
both source and pattern transparency modes are set to opaque.
Table 2-5. Logical Operation (ROP3)
Each column of destination, source, and texture values are the input
to the logical function. The result, 252, is the value that would be sent
to identify the logical operation (source and pattern transparency
modes are opaque). The last row, “ROP3 + Transparencies (source &
pattern are transparent)” shows the result if source and pattern
transparency modes are transparent (the default transparency mode).
Bits
7 6 5 4 3 2 1 0
Texture 1 1 1 1 0 0 0 0
Source 1 1 0 0 1 1 0 0
Destination 1 0 1 0 1 0 1 0
ROP3 (source & pattern are opaque) 11111100
(decimal 252)
ROP3 Transparencies
(source & pattern are transparent)
11101010