Quad/Graphics Inc., which calls itself the largest privately held printer in the U.S., said Tuesday it plans to take the company public after it acquires Canadian-based World Color Press Inc., the second-largest provider of print and digital-media in the Americas. Quad/Graphics said it intends to become a publicly traded company when the deal closes in the summer of 2010. Quad/Graphics chief executive Joel Quadracci will lead the expanded company as its chairman, president and CEO.