Do most graphic designers know how to duplicate an image and optimise its resolution for print, web use and video production...judging by what we've experienced, probably not!
Graphic Design is as much about the proposed use of a given image as its creative design. Understanding different media and its requirements is key to producing high quality images and branding for any use you may require it for - a wall hoarding - press advertisement - brochure - website - web video or full size DVD.