Service manual

IMAGE DATA PROCESSING
B358 2-4 SM
2.3 IMAGE DATA PROCESSING
The FCI in the LD unit is responsible for edge smoothing and toner saving
functions.
The edge smoothing and toner saving modes can be switched on or off using the
printer user tool or the printer driver.
2.3.1 EDGE SMOOTHING
Usually, binary picture processing generates jagged edge on characters as shown
in the above left illustration. The FCI reduces the edges of characters using edge
smoothing.
Whether or not the object pixel undergoes smoothing depends on the surrounding
image data. Smoothing for the object pixel is done by changing the laser pulse
position.
2.3.2 TONER SAVING MODE
Toner saving is done by reducing the number of black dots printed, not by varying
the development bias. In toner saving mode, the image data is filtered through a
matrix.
As a result of passing through the filter, less toner is used to create the latent
image on the drum, and black areas print as gray.
B358D504.WMF