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Edge enhancement

Creating hard, crisp, high-contrast edges beyond the correction of the geometric problem compensated by aperture correction, frequently creates the subjective impression of increase image detail.

Transversal delay lines and second-directive types of correction increase the gain at higher frequencies while introducing rather symmetrical “undershoot followed by overshoot” at transitions. In fact, and contrary to many causal observations, image resolution is thereby decreased and fine detail becomes obscured. Creating a balance between the advantages and disadvantages is a subjective evaluation and demands an artistic decision.

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