Actually, the “image” is a 3-D replica that was “burned” into the shroud when Christ rose - not a painting - ala a micro Big Bang burst of energy.
Even 21st century technology cannot replicate that 3-D image.
Just that factoid certainly indicates the Shroud of Christ is not only real but proves He is exactly who He said He was.
It actually is not truly 3D, it is however a database of 3D data in a 2D representation, a terrain map in which 3D data is encoded in the image by distance being inversely proportional to the intensity of the image. i.e., the closer the cloth, the darker the image.