On its own, the color manager is pretty much useless if gnome-settings-daemon and gnome-control-center are missing. Most functionality is unavailable. This includes the settings screen, among other things.
Either these two should be added as dependencies, or (in case lack of most functionality does not warrant a dependency) a POSTINST message should be added notifying the user of this.
But that will lead to other people being angry because of RDEPENDing on more gnome stuff that is really optional :/
*** Bug 520842 has been marked as a duplicate of this bug. ***