Postprocessing of Infrared Reflectography to Support the Study of a Painting: The Case of Vivarini's Polyptych

Table 1

Additional features provided by IR2 with respect to visible, and by PCA and NDI with respect to visible and IR2.

Color	Additional features provided by	With respect to
Red	IR2, PC2, PC3, and NDI	Visible (RGB and PAN)
Purple	IR2, PC2, PC3, and NDI	Visible
Blue	NDI	Visible and IR2
Orange	PC2 and NDI	Visible and IR2
Green	PC3 and NDI	Visible and IR2