Acutance is how sharp an edge is.
Low acutance is a blurry edge that merges into the next thing in the photo.
High acutance is a sharp edge that is well-defined and clear.
What affects acutance?
Acutance is dependent on the quality of your lens, and on post-processing techniques (e.g. sharpening tools and blurring/ unsharpening tools).
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