Canon LBP7780CX User Manual page 279

The printer switches the paper size if the paper of the size to be used is not loaded in the
Substitute size printer.
If printed plain paper curls, specify the setting for this item.
Curl correction
If the centers of dense text or lines are not being printed, specify the setting for this item.
Special image mode
If plain paper with a smooth surface is used, the density may be low. In such a case, specify
Smooth plain paper the setting for this item.
Specifies whether the printer outputs the blank page that can be created due to no data
Paper save existing in the page data sent from an application.
"[Setup] Menu ([User Maintenance] Options)"
"[Setup] Menu ([User Maintenance] Options)"
"[Setup] Menu ([User Maintenance] Options)"
"[Setup] Menu ([User Maintenance] Options)"
"[Setup] Menu ([UFR II] Options)"