Configuring default resolution and color depth for RealVNC's vncserver-x11-serviced?

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http://unix.stackexchange.com – When searching the web for information about how to configure the default resolution and color depth for RealVNC sessions, I always come across stuff that talks about passing commandline parameters to vncserver, such as vncserver -geometry 1024x768 or something. However, I have my system configured to start the RealVNC server on boot (for runlevels 2-5; I'm using Debian) via the /etc/init.d/vncserver-x11-serviced script that RealVNC installs; I'm not using the vncserver command. How do I configure this to have a particular default resolution and color depth? Is there a config file somewhere (HowTos)