1. Method of characterizing the imperfections of the skin of a person, comprising the following steps: a) taking of at least one digital image of at least one determined skin zone, the image being defined by a multiplicity of pixels with the aid of a digital video camera or digital still photo or picture camera, that is transmitted to a digital image processing device; b) splitting the thus recorded digital image into three colour planes: red, green, blue, termed R, G, B, with the aid of the image processing device; c) extracting a single of these planes; d) calculating at least one of the following parameters, by appropriate means of calculation, on the basis of this plane: a mean grey level of the image; a surface area of the imperfections of the skin of the image, some of which are related to aging, such as wrinkles, sign lines, spots, dark circles, pigmentary imperfections, slackening or loosening zones; the variance of the grey levels over the set of pixels of the image as parameter representative of the homogeneity of the skin.