Given how Raging Bull's black and white color palette significantly tones down one boxing element, it is hard not to wonder why Martin Scorsese did not film it in color. Martin Scorsese's movies are known to be bold, intense, and provocative. Featuring all the hallmarks of his unique directorial vision, Raging Bull, too, went against the grain and cemented it place as one of the most memorable sports movies to be ever made despite taking a big risk.

https://screenrant.com/raging-bull-martin-scorsese-black-white-why-blood/