PCL 5 Color Technical Reference Manual - Business Support ...

Logical Operation Command
Specifies the logical operation (ROP) to be performed in RGB color
space on destination, source and texture to produce new destination
data. Texture is defined as a combination of pattern and foreground
color.
?*l # O
# = Logical operation value (see Table 5-4)
Default = 252 (TSo)
Range = 0 to 255
The Logical Operation code, or Raster OPeration (ROP) code, is
simply a systematic method of encoding all of the 256 possible ways
that a Texture, Source, and Destination can be combined. Table 5-4
gives a table of ROPs from ROP 0 to ROP 255, where each operation
is defined as a logic equation. This table can be difficult to understand
and use. Furthermore, it does not show the differences that depend
on the color space. A truth table is an alternative method for
understanding the results of a logical operation. When used with
ROPs for finding the resulting destination value, it is more easily
understood than the logic operation.
ROP RGB 252 (11111100) 1
(T)exture (S)ource (D)estination (D)estination
1 1 1 1
1 1 0 1
1 0 1 1
1 0 0 1
0 1 1 1
0 1 0 1
0 0 1 0
0 0 0 0
1 The first destination column is ignored and the second destination column is the result
of the ROP (White = [1,1,1] and Black = [0,0,0] ).
EN The PCL Print Model 5-13