HP PCL/PJL reference (PCL 5 Printer Language) - Technical Reference Manual Part I

EN Pattern Transparency Mode Command 13-7
Pattern Transparency Mode Command
The Pattern Transparency Mode command sets the pattern’s
transparency mode to transparent or opaque.
E
C
* v # O
# =0 - Transparent
1 - Opaque
Default = 0
Range = 0, 1 (other values cause the command to be ignored)
A transparency mode of “0” (transparent) means that the white
regions of the pattern image are not copied onto the destination.
A transparency mode of “1” (opaque) means that the white pixels
in the pattern are applied directly onto the destination.
Note When printing white rules, the pattern transparency is treated as if it
were “opaque”; white rules erase black rules regardless of the
transparency mode.
Refer to the preceding definitions and the discussion of Figure 13-3
and Figure 14-3 for an explanation of the effects of transparency.