Proof of concept[edit]
Principal photography began on March 29, 2004. Several of the scenes were shot before every actor had signed on; as a result, several stand-ins were used before the actual actors were digitally added into the film during post-production.[7] Rodriguez, an aficionado of cinematic technology, has used similar techniques in the past. In Roger Ebert's review of the film, he recalled Rodriguez's speech during production of Spy Kids 2: The Island of Lost Dreams: "This is the future! You don't wait six hours for a scene to be lighted. You want a light over here, you grab a light and put it over here. You want a nuclear submarine, you make one out of thin air and put your characters into it."[8]
The film was noted throughout production for Rodriguez's plan to stay faithful to the source material, unlike most other comic book adaptations. Rodriguez stated that he considered the film to be "less of an adaptation than a translation".[7] As a result, there is no screenwriting in the credits; simply "Based on the graphic novels by Frank Miller". There were several minor changes, such as dialogue trimming, new colorized objects, removal of some nudity, slightly edited violence, and minor deleted scenes. These scenes were later added in the release of the Sin City Collectors DVD, which also split the books into the four separate stories.[9]