Image Data Processiing - Ricoh G031 Service Manual

2.1.3 IMAGE DATA PROCESSIING

Edge smoothing and toner saving are performed by an ASIC (ROCKY W). The
edge smoothing and toner saving modes can be switched on/off with the machine's
control panel or the printer driver.
Edge Smoothing
Fig. A
Fig. B
Fig. C
Jagged edges on characters as shown in the above illustration are reduced using
edge smoothing. Edge smoothing changes the laser pulse duration and position for
certain pixels.
Fig. A shows the four possible pulse durations, and Fig. B shows how the laser
pulse can be in one of three positions within the pixel. Fig. C shows an example of
how edge smoothing is used.
Edge smoothing is not done for 1,200-dpi printing.
Toner Saving Mode
Toner saving is done by reducing the number of black dots in the printed image. An
8 x 8 matrix filter is used.
As a result, less toner is used to create the latent image on the drum and black
areas print as gray.
The printer driver prevents edge smoothing and toner saving mode from being
used at the same time.
SM
Main Scan Direction
4/4 3/4
S u b S c a n
Direction
2-3
2/4 1/4 0
G031D504.WMF
PRINTING
G031/G032