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    Acutance is a term clear for everyone. From the point of view of consumer-viewer, it’s possible to discern without effort all details important for the subject image on a picture with high acutance. Everything seems simple. However this simplicity, as the saying goes, is worse than theft.
    Imagine a portrait of a middle-aged youthy lady that has been shot with assistance of all modern technologies. You can count every skin pore, every wrinkle, every spot. Imagine that a portrait of a political party leader  on the election poster is made in such “high-quality” way. Imagine that ideally sharp whites of eyeballs are not white really and have yellow tint and red blood-vessel veins, and a net of minor horizontal and vertical wrinkles around eyes. It’s obvious that in this case acutance, i.e. readability of details must be limited. (See photo 1).