Canon 08011-41-UD2-003 Installation And Configuration Manual page 133

7. If you want to specify the end user's interface background and foreground colors
for the special buttons:
7.1 Click the [Background Color] text box under <Special Button> ➞ enter
three comma-separated digits representing the desired RGB color.
7.2 Click the [Foreground Color] text box under <Special Button> ➞ enter
three comma-separated digits representing the desired RGB color.
7.3 Click [Save] to save the settings currently displayed in the settings area, and
to update the end user's interface special buttons to use the new settings.
The preview area displays the updated colors.
Authorized Send Installation and Configuration Guide for imageRUNNER Machines 133