That is what a graphic designer does... sorry to here that that over there they seem to need two people for this. If you are talking about someone who does little actual work on the computer (say in quark or in-design) but decides on concept and imagery that may, depending upon the case, be the work of an art director (often someone who has moved up from designer) but all of what you describe above is done by the graphic designer. In some cases for less expericenced desginers they may be a pre-press guy at the printers who would assist in color seperation or traps or something like that but he is a pre-press guy and never ever deals with handling or changing any design data. (much of this process is now simplfied due to direct digital solutions)
The only thing even remotely close are what are called 'operators' who do simple pre-design layout work for things like supermarket adds and real estate catalogs. These people (90% women) are basically throw-away part timers getting paid by the hour (about the same as you get working at KFC).
My suggestion... say you are a graphic designer, it is not like that title has any kind of grand status attached to it here... more the opposite usually.