Appeal No. 1998-0671
Application 08/285,328
discloses the same two stage screening method and apparatus as
disclosed in the APA.
Eschbach discloses a method of scaling bitmapped images by
small amounts to compensate for erosion or dilation effects of an
imaging process. In "write-white" elecrophotographic systems, a
laser dissipates charge on the photoconductive surface in areas where
printing is not desired; thus, it might be said that white pixels are
written to the photoconductive surface. In "write-black"
elecrophotographic systems, a laser dissipates charge on the
photoconductive surface in areas where printing is desired; thus, it
might be said that black pixels are written to the photoconductive
surface. "Write-white systems tend to shrink or erode black lines,
while write-black systems tend to expand black lines." (Col. 1,
lines 38-40.) A bitmap to be prepared for printing is initially
increased in resolution by a selected factor; e.g., if a half pixel
size compensation is required to account for the erosion or dilation
effects of the printer, an increase in resolution of 2 is chosen as
shown in figure 3. Next, the bitmapped image is increased or
decreased in size to compensate for the erosion or dilation of the
printing process; e.g., to account for a half pixel erosion, a pixel
at the higher resolution is added to the image as shown in figure 4.
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