Method to generate a procedural map (50) having a tree structure (40) comprising a plurality of levels (43), each one with at least one node (41) to which is associated at least one parameter, comprising the steps consisting in: providing a tool for parameter setting adapted to parameterize the tree corresponding to the map to provide and adapted to be connected to at least one external source of parameters; receiving, via the tool for parameter setting (or generation of procedural maps) the parameters of the map to be provided; at least one of said parameters coming from an external source; processing said parameters, in order to generate said map; Such a map comprises parameters and a structure allowing it to provide “special” effects in the field of image processing.The invention further provides a tool for generation and/or modification for the implementation of said method.