Fig. 1. Cloud map of construction points
(a): Section diagram; (b): Elevation diagram

Fig. 2. Orthographic image and local maps of the northern wall paintings of the Three Sages Temple in diffused lighting

Fig. 3. Drawing process
(a): Checking the thread first and filling in the color; (b): Filling in the color first and checking the thread;(c): Gilding with leach powder; (d): Pigment layer superimposed

Fig. 4. Digital microscope magnification of pigments by color
(a): Red pigment test site; (b): Blue pigment test site; (c): Green pigment test site; (d): White pigment test site

Fig. 5. Information about the background of Huayan murals

Fig. 6. Visible image and ultraviolet image
(a): Visible image; (b): Ultraviolet image

Fig. 7. Pigment collection area by hyperspectral imaging
(a): Collection area; (b): Red; (c): Orange; (d): Green; (e): Blue; (f): White

Fig. 8. Mean spectrum of red and orange pigment

Fig. 9. First derivative curve of red and orange pigment

Fig. 10. Mean spectrum of green and blue pigment

Fig. 11. Flow chart of pigment layers by nondestructive in-situ analysis