HP 4 FAMILY - Manual (Page 51)

Notes 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).
Logical Operations
and Transparency
Interactions
As described above, transparency modes operate in addition
to logical operations. The logical operations in Table 2-5,
Logical Operations (ROP3), on the following pages, are true
only if source and pattern transparency (for white pixels)
are explicitly set to opaque (?*v1N and ?*v1O). If source
and/or pattern transparency modes are transparent
(defaulted), the additional operations shown on the
following page must be performed to achieve the final
result.
Printer-Specific Differences 2-15