unsharp

From Middle English *unscharp, from Old English unsċearp, from Proto-West Germanic *unskarp, from Proto-Germanic *unskarpaz, equivalent to un- +‎ sharp. Cognate with Saterland Frisian uunskäärp (“unsharp”), West Frisian ûnskerp (“unsharp”), Dutch onscherp (“unsharp”), German Low German unscharp (“unsharp”), German unscharf (“unsharp”), Danish uskarp (“unsharp”), Swedish oskarp (“unsharp”), Norwegian uskarp (“unsharp”).

unsharp (comparative more unsharp, superlative most unsharp)

1. Not sharp.
   1. (computer graphics) Out of focus; blurry.
   2. Dulled or intentionally blunt.

      an unsharp tool

• nonsharp

• sharp
• crisp

• unsharpness

unsharp (third-person singular simple present unsharps, present participle unsharping, simple past and past participle unsharped)

1. (transitive, computer graphics) To sharpen (an image) by creating a blurred ("unsharp") negative as a mask, and then combining that mask with the original.

• Not to be confused with unsharpen.