Abstract: A method for investigating visual properties of a sample surface using a spectrophotometer having an integrated camera comprises acquiring at least one image of a measurement area of the sample surface for at least one measurement geometry, using the integrated camera of the spectrophotometer, and determining a defect indicator that is indicative of defects of the sample surface in the measurement area. The step of determining a defect indicator comprises analyzing pixel values of the at least one image, using at least one processor.

Abstract: A computer-implemented method of modifying a texture image (T) representing a texture of a coating is disclosed. The texture image comprises a plurality of pixels (P), each pixel having a pixel value (TP(x)) in a color space and being associated with a surface position (x1, x2) on a surface (11) of the coating. The method comprises, for at least one pixel (P) in the texture image, the steps of defining a depth at which a virtual reflecting object is located below the surface of the coating at the surface position; for at least one component of the color space, determining an attenuation factor (A2(l, ?,x)) for light that has entered the coating through the surface as incident light and has been reflected at the virtual reflecting object to form reflected light, based on a simulation of light transport through the coating along said light path; and modifying the pixel value of the pixel to obtain a modified pixel value (TP?(x)), using the attenuation factor.