The Call of Cthulhu is a 2005 independent silent film adaptation of the H. P. Lovecraft short story The Call of Cthulhu, produced by Sean Branney and Andrew Leman and distributed by the H. P. Lovecraft Historical Society. It is the first film adaptation of the famous Lovecraft story, and uses Mythoscope, a blend of vintage and modern filming techniques intended to produce the look of a 1920sera film. The film is a length of a featurette.
In the original story, the narrator does not seem to end in a lunatic asylum or experience any mysterious nightmares himself.Early on in production, Branney and Leman decided to film it as a blackandwhite silent film. The official site says this was done to show what the film would have looked like had it been made in 1926, when the story was first published. In the DVD commentary the producers admit that shooting in black and white provided many other benefits. When using blackandwhite cinematography, a filmmaker does not need to pay particular attention to the materials and decoration of sets, as the colors will not appear in the final product. ........
Source: Wikipedia