HP PCL 5 User Manual Page 76

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5-12 The PCL Print Model EN
Logical Operations and Transparency
Interactions
As described above, transparency modes operate in addition to
logical operations. The Logical Operations (ROP3) in Table 5-4 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 below must be performed to achieve the final result.
The four basic interactions are:
Case 1: Source and Pattern are opaque.
Texture = Color & Pattern.
RETURN ROP3 ( Dest, Src, Texture ).
Case 2: Source is opaque, Pattern is transparent.
Texture = Color & Pattern.
Temporary_ROP3 = ROP3 ( Dest, Src, Texture ).
Image_A = Temporary_ROP3, & Not Src.
Image_B = Temporary_ROP3 & Pattern.
Image_C = Not Pattern & Src & Dest.
RETURN Image_A | Image_B | Image_C
Case 3: Source is transparent, Pattern is opaque.
Texture = Color & Pattern.
Temporary_ROP3 = ROP3 ( Dest, Src, Texture ).
Image_A = Temporary_ROP3 & Src.
Image_B = Dest & Not Src.
RETURN Image_A | Image_B
Case 4: Source and Pattern are transparent
Texture = Color & Pattern.
Temporary_ROP3 = ROP3 ( Dest, Src, Texture ).
Image_A = Temporary_ROP3 & Src & Pattern.
Image_B = Dest & Not Src.
Image_C = Dest & Not Pattern.
RETURN Image_A | Image_B | Image_C.
Note The Transparency Mode is applied based on the color of each pixel.
However, the Logical Operation is applied on a bit-by-bit basis without
regard to color. In order to obtain a result consistent with the Logical
Operation, the transparency modes should be set to Source Opaque
and Pattern Opaque. In order to obtain a result consistent with the
desired transparency mode, the Logical Operation should be set to
252 and the foreground color set to black.
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