1. Method for reproduction of originals, including originals of non-metameric colour composition, where the original is scanned in each case, with respect to its colour content, according to a tristimulus method and after processing of the scanning signals a reproduction is obtained, via colour mixture, by means of a predetermined colour rendition system, characterized in that the scanning signals (E.sub.R,E.sub.G,E.sub.B) are converted, into three primary colour signals (e.g. X, Y, Z) having actual colour values in a predetermined colour coordinate system corresponding substantially identically to theoretical colour values of the original, and that adaptation of the primary colour signals or the signals deriving from these to at least one colour rendition system and/or measures to alter the gradation and/or objective measures to alter the colour rendition of individual colours in the overall image or in discrete areas of the image and/or any other further non-linear processing of the primary colour signals or the signals deriving from these are only carried out after said scanning signals have been converted into the primary colour signals having actual colour values in said predetermined colour coordinate system corresponding substantially identically to said theoretical colour values of the original.