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Logical Operations
and Transparency
Interactions
As described above, transparency modes operate in addition
to logical operations. The Logical Operations (ROP3) in
Table 5-2 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.
5-12 The PCL Print Model5-12 The PCL Print Model