A Note on the Use of False-Color Infrared Photography in Conservation

Mobile hyperspectral imaging for the non-invasive study of a mural painting in the Belves Castle (France, 15th C).

“…The IRFC image typically distinguishes single pigments or pigments mixture of similar colour but of different composition. The comparison of the IRFC image of the reference pigments with those of the painting allows us to hypothesize about the nature of the pigments (Moon, Schilling and Thirkettle 1992). Since the 1960 ′ s, infrared reflectography is a technique used to look through the paint layers.…”

“…IRFC images As previously with photographic devices (Moon, Schilling and Thirkettle 1992), the comparison of the IRFC image of the reference pigments to those of the painting allows hypothesis about the nature of the pigments used in the painting. IRFC often allows us to hypothesize on the pigment used by comparing colors with that of the same images (RGB and IRFC) of reference pigments (Cucci et al 2011).…”

Pinturas murales de la casa de Ariadna (Pompeya, Italia): Un estudio multidisciplinar de su estado actual enfocado a una futura restauración y conservación preventiva

“…Infrared false-color photography is a useful supplementary technique for the examination and characterization of objects, especially pigment identification (35). Figure 9 is useful for a more thorough explanation of this technique, where we can see more details and a greater definition of the lines and contours that would be essential in a future restoration.…”

“…La fotografía Infrarroja en falso color es una técnica complementaria interesante para el estudio y caracterización de los objetos, en especial la identificación de pigmentos (35). La Figura 9 es útil para una explicación más detallada de esta técnica, donde se pueden ver más detalles y una mayor definición de las líneas y contornos que serían esenciales para una futura restauración.…”

Recovery of archaeological wall paintings using novel multispectral imaging approaches

“…Since only three spectral bands can be displayed in a color image, three channels are picked from the multispectral set and superimposed in the form of a (false) color image. The most usual combination is Infrared, Red and Green (IrRG), although the combination Infrared, Green and Blue (IrGB) [13] can also be used. This procedure implies that one channel is discarded, so the information it carries is lost in the final image.…”