Fig. 2
From: Improved spectral imaging microscopy for cultural heritage through oblique illumination
RGB images of a cross section from Picasso’s La Miséreuse accroupie acquired at a β = 0° and b β = 180°. The arrows highlight distinct differences between images due to illumination direction. c Reflectance spectra extracted from the yellow-orange particle at β = 0° (red trace) and β = 180° (black trace). See Additional file 1: Movie S1 for multiple illumination angles of this sample