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the image is not a reflected light image as a painting would be
. . . in referece to the wikipedia text,
Painting
The pictures of the man on the shroud seem like chiaroscuro images, pictures created of reflected light as an artist would perceive it. When we look at the pictures on the Shroud, and particularly the face, we see seemingly three-dimensional pictures on a flat two-dimensional plane, much as we do when we look at a conventional painting of a person (or a photograph). The cheeks, as they curve around from the front of the face, seem to recede into shade. The hollows of the eyes are evident from their darker tones. The tip of the nose is white and stands out. This is how reflected light works on the human face. It looks like a painting of reflected light. But it is not.
What to our eyes seems like the highlights, lowlights, and cast shadows of reflected light on a human form is not light at all. It is certainly not light as an artist would interpret it. Computerized image analysis reveals no directionality to implied light. The brightness does not come from any angle, as it must for reflected light image. It is not from above or below. It does not come from the right or the left. It does not come from the front.
It is not a painting of a human body. The face is not a painting of a human face.
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Painting
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