HP L 5 manual Logical Operation Command, ?*l # O, Roprgb 252 Texture Source Destination

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.

ROPRGB 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

1The 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