The invention provides a method for accurately capturing color digital images of the surface of a measurement object. The method comprises the steps of: a, arranging a plurality of light sources providing at least three lighting directions relative to the normal direction of the surface in a common plane; b, arranging a spectrograph which is located in at least one observation direction in the common plane relative to the normal direction and used for providing spectral information; c, arranging a digital color camera providing color image data; d, arranging a beam splitter which splits a common light path on the light path in at least one observation direction, the beam splitter guiding one part of the common light path to the spectrograph and guiding the other part out of the common plane to the camera, wherein the beam splitter is configured to rotate around the common light path and rotate out of a system plane for about 45 degrees so that measuring light for the camera is guided out of the system plane and s and p polarized components orthogonal at the system plane of the measuring light are in balance; e, arranging an electronic controller which controls the light sources, the spectrograph and the camera to obtain multiple groups of image data with different exposure time lengths.