**4. Future work**

The opportunity of collecting, in very little time and in noninvasive and contactless modal‐ ity, the spectral information of the entire artwork is undoubtedly an advantage of the HSI technique with respect to punctual analyses. When the aim is the material identification, the wavelength range used for the investigation surely affects the system performance. In this case, we worked in two bands, covering the range from 420 to 1000 nm, but the use of wider ranges can surely improve the performance of the HSI for identifying also organic materials, such as consolidating materials [29], natural polymers and resins [30], or to map paint binders in situ [31].

Moreover, HSI offers the possibility of calculating the colours of the artwork in a more controlled way: some attempts have been made for applying this technique to the digital documentation of the artworks through the production of high‐quality images [32], maybe comparable to professional photographs.

Probably the future, natural development of the hyperspectral imaging may be the integra‐ tion of the HSI in 3D acquisition systems that will solve the problem of not flat surfaces.
