In photography and imaging, the property of sharpness or clarity that describes how well edges are defined in an image.
A technical term formed from 'acute' (sharp) with the suffix '-ance' (quality or state of), created in the mid-20th century for photographic science.
Photographers and filmmakers use 'acutance' to describe something different from 'sharpness'—it's specifically about edge contrast, which is why a photo can be technically sharp but have low acutance if edges blur together smoothly.
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