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unsharp mask filter

Unsharp masking — is an image manipulation technique now familiar to many users of digital image processing software, but it seems to have been first used in Germany in the 1930s as a way of increasing the acutance, or apparent sharpness, of photographic images.… … Wikipedia
Masking (in art) — Contents 1 In painting 1.1 Solid masks 1.2 Liquid masks 2 … Wikipedia
Depth of field — The area within the depth of field appears sharp, while the areas in front of and beyond the depth of field appear blurry … Wikipedia
Chasys Draw IES — Developer(s) John Paul Chacha s Lab [1] Stable release 3.66.02 / 5 September 2011; 51 days ago (2011 09 05) Operating system … Wikipedia