Method for calibrating a screen for the true to original reproduction of surface colours whose spectral reflectance distribution is measured and known on a screen, which is operated under incident light from at least one light source with angles of incidence of the light that are outside the grazing angle and with known spectral light distributions, wherein the screen is able to be influenced by setting parameters using software and electronic control in each subregion of the screen, characterized in that 1.1. in each subregion of the screen, the reproduced colour impression of the screen is adapted to the colour impression of an original by comparing the original directly adjacent on the screen surface to the screen colours and changing the screen parameters until the colour impression of the original and of the screen at the respectively observed screen partial surface appears to be identical for an observer, observed from a predetermined observer angle, 1.2. and the settings performed are stored in a screen profile, wherein 1.3. a mask is used in front of the screen, which contains a number of windows that are distributed over the entire image surface, wherein each window is covered partially, preferably half-covered, by an original of a surface colour, and the colour reproduction which is assigned to the respective surface colour is produced behind each of the non-covered window partial surfaces on the screen, and 1.4. that software runs in a computer actuating the screen with which the brightness of the reproduced colours in each window can be changed and set such that 1.4.1. for the observer no brightness difference between original and reproduced colour under the illumination of the screen exists anymore, and 1.4.2. the brightness values are stored as support points, and established therefrom is a brightness profile which controls the absolute brightness for each colour that is reproduced in a pixel, and 1.5. the brightness correction and the ascertainment of the support points for the brightness profile of the screen are performed automatically by a camera, as an observer, recording the image of the mask, 1.5.1. wherein the region of the surface colours and of the colours which are reproduced by the screen are selected for each window of the mask and colour signals which are measured and averaged within these regions are produced, 1.5.2. said colour signals are fed to a computer which controls the monitor, and in the process the brightness of the colour signals is iteratively changed until the colour signals produced by the surface colour and its reproduction are equal in each window. 1.1. in each subregion of the screen, the reproduced colour impression of the screen is adapted to the colour impression of an original by comparing the original directly adjacent on the screen surface to the screen colours and changing the screen parameters until the colour impression of the original and of the screen at the respectively observed screen partial surface appears to be identical for an observer, observed from a predetermined observer angle, 1.2. and the settings performed are stored in a screen profile, wherein 1.3. a mask is used in front of the screen, which contains a number of windows that are distributed over the entire image surface, wherein each window is covered partially, preferably half-covered, by an original of a surface colour, and the colour reproduction which is assigned to the respective surface colour is produced behind each of the non-covered window partial surfaces on the screen, and 1.4. that software runs in a computer actuating the screen with which the brightness of the reproduced colours in each window can be changed and set such that 1.4.1. for the observer no brightness difference between original and reproduced colour under the illumination of the screen exists anymore, and 1.4.2. the brightness values are stored as support points, and established therefrom is a brightness profile which controls the absolute brightness for each colour that is reproduced in a pixel, and 1.5. the brightness correction and the ascertainment of the support points for the brightness profile of the screen are performed automatically by a camera, as an observer, recording the image of the mask, 1.5.1. wherein the region of the surface colours and of the colours which are reproduced by the screen are selected for each window of the mask and colour signals which are measured and averaged within these regions are produced, 1.5.2. said colour signals are fed to a computer which controls the monitor, and in the process the brightness of the colour signals is iteratively changed until the colour signals produced by the surface colour and its reproduction are equal in each window.