Method for characterisation of a laser engraving of a fabric, in particular denim, said laser engraving being able to apply different degrees of engraving in fabrics, in particular depending on the amount of energy transmitted by a laser; characterised in that the method comprises: - providing a pattern, on a physical piece of fabric having a plurality of engraved zones, corresponding to a plurality of degrees of engraving; and - a processing stage comprising the steps of: [a] providing a fabric image and at least one fabric parameter, thus characterising a target fabric; [b] providing at least one laser engraving parameter, thus characterising a target laser engraving; [c] generating a plurality of output images, each for a different degree of engraving, and each being a simulated result of applying said target laser engraving to said target fabric; [d] establishing a correspondence between each engraved zone of said plurality of engraved zones and the output image of said plurality of output images that is more similar to said engraved zone; [e] thus obtaining a correspondence between degrees of engraving in said pattern and degrees of engraving for said target laser engraving applied to said target fabric that most resemble those in said pattern; thus obtaining a characterisation of said target laser engraving for said target fabric given said pattern. - providing a pattern, on a physical piece of fabric having a plurality of engraved zones, corresponding to a plurality of degrees of engraving; and - a processing stage comprising the steps of: [a] providing a fabric image and at least one fabric parameter, thus characterising a target fabric; [b] providing at least one laser engraving parameter, thus characterising a target laser engraving; [c] generating a plurality of output images, each for a different degree of engraving, and each being a simulated result of applying said target laser engraving to said target fabric; [d] establishing a correspondence between each engraved zone of said plurality of engraved zones and the output image of said plurality of output images that is more similar to said engraved zone; [e] thus obtaining a correspondence between degrees of engraving in said pattern and degrees of engraving for said target laser engraving applied to said target fabric that most resemble those in said pattern; thus obtaining a characterisation of said target laser engraving for said target fabric given said pattern. [a] providing a fabric image and at least one fabric parameter, thus characterising a target fabric; [b] providing at least one laser engraving parameter, thus characterising a target laser engraving; [c] generating a plurality of output images, each for a different degree of engraving, and each being a simulated result of applying said target laser engraving to said target fabric; [d] establishing a correspondence between each engraved zone of said plurality of engraved zones and the output image of said plurality of output images that is more similar to said engraved zone; [e] thus obtaining a correspondence between degrees of engraving in said pattern and degrees of engraving for said target laser engraving applied to said target fabric that most resemble those in said pattern;