<P> On the method of creating the sets, Craig said he often started by sketching ideas onto a blank sheet of paper . Stephanie McMillan also said that "each film always had plenty of new challenges," citing the changes in visual style between directors and cinematographers as an example, along with the developing story in the novels . Due to J.K. Rowling's descriptions of various settings in the novels, Craig noted his "responsibility was to place it together". </P> <P> Craig commented on his experience working in the studio environment: "I'm the production designer, but on a big movie like Harry Potter I may be responsible for 30 to 35 people; from the supervising art director, and a team of art directors and assistants, to draughtsmen and junior draughtsmen, and then on to model makers, sculptors and scenic artists ." He said, "Ten years ago, all the Harry Potter drawings were done in pencil . I would take my roughs and plans and sections and give them to a professional architectural illustrator, who would create concept art using pencil and colour wash on watercolour paper ." He said the process changed slightly throughout the years due to, what he called, the "digital revolution" of making films . </P> <P> When filming of the series was completed, some of Craig's sets had to be rebuilt or transported for them to be displayed at the Warner Bros. studio tour . </P> <P> Six directors of photography worked on the series: John Seale on the first film, Roger Pratt on the second and fourth, Michael Seresin on the third, Sławomir Idziak on the fifth, Bruno Delbonnel on the sixth, and Eduardo Serra on the seventh and eighth . Delbonnel was considered to return for both parts of Deathly Hallows, but he declined, stating that he was "scared of repeating" himself . Delbonnel's cinematography in Half - Blood Prince gained the series its only Academy Award nomination for Best Cinematography . As the series progressed, each cinematographer faced the challenge of shooting and lighting older sets (which had been around since the first few films) in unique and different ways . Chris Columbus said the series' vivid colouring decreased as each film was made . </P>

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