acutance

n. ability of a photographic material to duplicate the transition at a boundary in the original image

In photography, acutance is the edge contrast of an image. Acutance can be more specifically defined as the amplitude of the derivative of brightness with respect to space. Due to the nature of the human visual system, an image with higher acutance appears sharper even though an increase in acutance does not increase real resolution.
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acutance
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ACUTANZA. INCISIONE [CINEMA]