From this You can:

menu:

NOTE: This setting is available only on the PCL emulation driver, PostScript emulation driver, or on the printer Embedded Web Server.

Gray Correction

Brightness

Automatically adjust the contrast enhancement applied to images.

Auto*

Off

Auto applies different gray values to each object on the printed page.

Off turns off gray correction.

Adjust the gray value of printed images.

-6 to +6 0*

Contrast

Adjust the contrast of printed images.

0–5

0*

* Factory default setting

Utilities Mode

Mode Menu

Mode Main Menu

Utilities

Hex Trace

Use the Utilities menu to troubleshoot printer problems.

1.From the menu list, use the Arrow buttons to scroll to the Utilities menu.

2.Press the Select button .

3.Press the Right Arrow button until the heading you want appears on the display, and then press the Select button .

4.Use the Arrow buttons to scroll through the available menu items.

5.When the setting you want appears on the display, press the Select button to save the setting.

Utilities Mode Main Menu

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Dell 2350D/DN, 2330D/DN manual Utilities Mode Main Menu, Mode Menu Mode Main Menu