Canon LBP7210Cdn Manual page 341

Click [OK] or [Print].
The printer starts printing.
Adjusting Color by Brightness (Gamma Adjustment)
You can adjust the brightness of the printout results without spoiling the lightest parts and darkest parts of the image
data.
Use this option when the printout result is brighter than the original image or when you want to change the brightness of
the image.
Select [Print] from the [File] menu in the application.
NOTE
About the printing procedure
The printing procedure may differ depending on the application you are using.
For details on the printing procedures, see the instruction manual supplied with the application.
Open the printing preferences dialog box.
(1) Select this printer.
(2) Click [Properties] or [Preferences].