Lexmark 640 User Manual

The quality menu operator panel options can be adjusted to help improve print quality. 

In addition, the Enhance Fine Lines and Gray Correction options can be enabled to improve print quality. These settings are 
available on the driver and on the printer Embedded Web Server (EWS) interface. For more information about these 
options, see the driver Help. 

Print Resolution

To select printed output resolution

600 dpi*

1200 Image Q

1200 dpi

2400 Image Q

Toner Darkness

Lightens or darkens printed output and 
conserves toner

1–10

8* is the default setting.

Select a lower number to lighten the 
printed output or save toner.

Brightness

Adjusts the gray value of printed 
objects

-6 – +6

0* is the default setting.

Contrast

Adjusts the contrast of printed objects

0–5

0* is the default setting.

†

 Values marked by an asterisk (*) are the factory default settings.

Enhance Fine Lines

A selection to enable a print mode 
preferable for certain files containing 
fine line detail, such as architectural 
drawings, maps, electronic circuit 
diagrams, and flow charts

On

In the driver, enable the check box.

Off*

In the driver, disable the check box.

Gray Correction

Automatically adjusts the contrast 
enhancement applied to images

Auto

In the driver, enable the check box.

Off*

In the driver, disable the check box.

†

 Values marked by an asterisk (*) are the factory default settings.