Method and apparatus for mounting and presenting of multi-colour separation films in exactly coinciding and registering positions, e.g. in a copying machine, whereby inter-related part-colour films or carrier foils therefore are provided with punch bores without any demands on accurate in mutual register thereof between the various individual part-colour films, whereupon a first, normative, part coulour film (e.g. B) is mounted with its punch bores on register pins (13) of a light table (11) belonging to a measuring and registering apparatus (14), the position of said normative part-colour film is registered as a zero-position, and the remaining inter-related part-colour films (e.g. Y, M, C) are successively mounted on the register pins (13) of the measuring and registering apparatus (14), and the positions of each such part-colour film is registered, whereby the difference in the X-direction and the Y-direction and the rotational difference (Z) in relation to the zero-position is observed and registered, and said registered differences are used for ultimately positioning of the films e.g. upon copy-printing thereof to a printing plate.