Method for online quality control of decorative prints on substrates, comprising the similarity comparison of an actual image and a target image of the print decors and the adjustment of the decorative print when deviations of the colour values of the actual image from the colour values of the target image are detected during the production of a batch of substrates with a decorative layer, wherein a) at least one hyperspectral digital image of a print decor is generated; b) the print decor is calibrated by means of the at least one hyperspectral digital image by generating an average hyperspectral digital image of the print decor, the display of which requires a high computing power and a high storage capacity; characterized in that, the method further comprises the steps of: c) generating and storing a target digital image of the print decor by converting the average hyperspectral digital image of the print decor into an image file in L*a*b or L*C*h colour space with a resolution in the range of 4 to 36 megapixels; d) creating at least one first print decor on at least one first substrate; e) generating and storing at least one digital actual image of the printed decor on the at least one first substrate with a resolution in the range from 4 to 36 megapixels, by means of a colour scanner or a digital camera; f) determination of colour deviations for one or more colour values of the L*a*b* colour space and/or the L*C*h° colour space between the digital target image and the digital actual image by a computer program; g) printing at least one side of further substrates while forming a decorative layer in such a way that colour deviations between the digital target image and digital actual images of the printed decorations on the further substrate occur only below a predetermined nominal value or only within a predetermined tolerance range. a) at least one hyperspectral digital image of a print decor is generated; b) the print decor is calibrated by means of the at least one hyperspectral digital image by generating an average hyperspectral digital image of the print decor, the display of which requires a high computing power and a high storage capacity; c) generating and storing a target digital image of the print decor by converting the average hyperspectral digital image of the print decor into an image file in L*a*b or L*C*h colour space with a resolution in the range of 4 to 36 megapixels; d) creating at least one first print decor on at least one first substrate; e) generating and storing at least one digital actual image of the printed decor on the at least one first substrate with a resolution in the range from 4 to 36 megapixels, by means of a colour scanner or a digital camera; f) determination of colour deviations for one or more colour values of the L*a*b* colour space and/or the L*C*h° colour space between the digital target image and the digital actual image by a computer program; g) printing at least one side of further substrates while forming a decorative layer in such a way that colour deviations between the digital target image and digital actual images of the printed decorations on the further substrate occur only below a predetermined nominal value or only within a predetermined tolerance range.