Glossary of Printing Terms:
Deep shadow

An area of an image not directly lit.

There are two categories of shadows: umbra and penumbra. Umbra denotes completely shadowed areas and is formed when there is only one pointed light source, as a result of which the area behind the object is completely unlit.

Penumbra refers to partially lit areas, when the light source is not pointed or when there is more than light source.


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