Canon BJC-3000 Series User Manual page 151

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Click the Quality tab and set Print Quality and Halftoning, as needed.
Print Quality:
When you wish to improve the print quality, drag the Print Quality slide bar
to the right (Fine). The print mode changes according to the setting of the
slide bar. Please note that using a higher setting in the direction of Fine
requires more time for printing.
Halftoning:
The colors and shapes of printouts are reproduced by the ink dots ejected
from the nozzles of the print head. Halftoning determines the color
boundaries of intermediate tones.
Fine (Fast):
Uses a simplified halftoning method for high speed printing.
Making the Most of the Printer Driver
Using the Windows Printer Driver 151