Fig. 4

Part of folio 83r imaged with the modified PRISMS spectral imaging system: a colour image for CIE D65 illumination and 2° standard observer derived from the spectral image cube; b image of the 880 nm near infrared spectral band; c zoomed in detail of the colour image of the text and the architectural motif in the upper left part of the folio; d the corresponding infrared band image at 700 nm; e zoomed in detail of the colour image of the bottom right hand side of the illumination and f the corresponding infrared band at 880 nm