Infrared reflectography (IRR) enables the visualization of details underneath the visible surface of a painting, such as underdrawing and pentimenti, thanks to the partial transparency of the painted layer when subjected to IR radiation.

The device developed by GBC simultaneously acquires the IR reflectography and the RGB composite image, scanning an area equal to 100x100 cm2 with a spatial resolution of 16 pixel/mm2 and a tonal resolution of some thousands of grey tones.

The two digital images can be completely super-imposed, making it possible to highlight the spatial correspondence between the visible and hidden details.