Digital printing is the art of printing from a digital image directly to a variety of media. Digital printing usually refers to professional printing where small-run jobs from desktop publishing and other digital sources are printed using large-format and/or high-volume laser or inkjet printers. Digital printing though expensive saves labour. Digital printing is used for personalized printing, such as for children's books customized with a child's name, photo books such as wedding photo books, or any other short book with varying page quantities and binding techniques. Digital printing is also used for outdoor banner advertising and event signage, in trade shows, in the retail sector and in personalized direct mail campaigns. Digital printing allows the ability to retouch or colour-correct a photograph before printing.