From the 1970s on, as the advent of television news began to affect the popularity of picture magazines, many photojournalists whose work had been published in magazines began to take advantage of a burgeoning interest in photographic picture books. These, often produced in conjunction with exhibits, comprised photographs of newsworthy events or topics of social interest along with informative texts. Working in black and white, Swiss-born photographer Claudia Andujar (working in Brazil) and Mexican photographer Graciela Iturbide portrayed indigenous peoples—groups they believed were becoming marginalized by society—and their customs. Other important figures included English photographer Don McCullin, who portrayed the devastation brought about by wars in Vietnam and in Africa; French photojournalist Raymond Depardon, who worked in Asia, Africa, and Europe; American Mary Ellen Mark, who photographed street performers and prostitutes in India, depicted street children in Seattle, Washington, and spent time documenting the inmates of a mental hospital; and Brazilian photographer Sebastião Salgado, who examined work and workers throughout the world, exhibiting and publishing a number of books on that topic. For his ability to make world events come pictorially alive, American James Nachtwey was three times the winner of the International Center of Photography’s photojournalism awards. By the end of the century, the technology used by these photojournalists had changed. Digital cameras sent images directly to computers, and programs allowed images to be altered seamlessly, making newspaper and magazine darkrooms obsolete.