For copying, quality is divided into scan quality and print quality and you can set them separately. For scan-to-file you set only the scan resolution.
The quality settings described here are available from
Copy tab/Quality button and Scan tab/Scan resolution button.

Scan Quality and Print Quality settings
Make scanner and printer quality settings separately.
Scan Quality
For the scanner set scan resolution in dpi (dots per inch).
-
Select Auto to make the program determine a dpi setting based on the type of original.
-
Uncheck Auto and press the Scan Resolution button to set your own dpi value.
-
Descreen tells the scanner to scan with the scanner’s optical resolution and relay the data to the software without interpolation. Optimal conversion to the set dpi or quality is then performed by the software. Gives superior results with raster originals. Scanning speed is reduced.
-
Turbo: Set the Scan resolution value or Auto and then select Turbo. This will basically double the scanning speed but with a reduction on image quality. Turbo resolution processing involves speeding up the paper’s movement, reduction of captured scan data in the scan direction and resampling to create the image resolution as set in Scan Resolution or Auto options. Turbo mode has no effect for resolutions below 300 dpi.
Print Quality
Select Fast, Normal or Best settings.