Canon EOS 1D Mark III Instruction Manual page 62

A Registering the Picture Style
If a Picture Style has already been registered under [User Def. *], changing
the base Picture Style in step 4 will nullify the parameters of the registered
contents of the Picture Style.
To shoot with the registered Picture Style, follow step 2 for selecting [User
Def. *] on the preceding page.
62
Set the parameter.
6
Turn the <5> dial to set the
parameter as desired, then press
<0>.
Press the <M> button to register
the new Picture Style. The Picture
Style selection screen will then
reappear.
The base Picture Style will be
displayed on the right of [User Def. *].
The name of the Picture Style having
any modified settings (different from
the default) registered under [User
Def. *] will be displayed in blue.