Color accurate acquisition stands as an important topic, especially on certain fields where color fidelity is of strategic importance. Prominent among these applications is that of imaging works of art, on demand for high-quality reproduction. The general purpose is to obtain a representation as closed as we would have seen the original scene. Fundamentals to color imaging are to get color data that are independent face to possible evolution in time of acquisition system parameters like internal sensor responses.This paper deals with problem of spectral sensitivity function determination. In the first part, a survey with classification of the reconstruction techniques is given. In the second part, we present direct and indirect estimation methods experimental procedures and results obtained for two cameras: a Kodak DCS Pro 14n camera and a PCO 2000 camera by Cooke Corporation. Finally, we describe some metric and perceptual criteria to evaluate spectral response functions reconstruction accuracy.