The method for determining at least one colour compatible with an outfit of a user, comprises: —a step (IMP) of importing at least one photographic image (IM) containing a representation of at least one portion of the outfit of the user; —a step (SEG) of segmenting said at least one image (IM), to identify at least one region of interest (S1, S2, S3) in the outfit; —a step (DET) of determining the colour of said at least one region of interest (S1, S2, S3); and —a step (GEN) of generating said at least one colour compatible with the outfit of the user, on the basis of the determined colour of said region of interest (S1, S2, S3) depending on a database (PAL1-PAL4) of compatible colours or on a computational rule (RGL, 11-71) for obtaining compatible colours.