Sharpening Using an Unsharp Mask - The Diigo Meta page

• 04 Aug 16
  

  dongzvip

  Photography

  • The sharpening process works by utilizing a slightly blurred version of the original image. This is then subtracted away from the original to detect the presence of edges, creating the unsharp mask (effectively a high-pass filter). Contrast is then selectively increased along these edges using this mask — leaving behind a sharper final image.
  • Note: Unsharp masks are not new to photography. They were traditionally performed with film
  • The human eye sees what are called "Mach bands" at the edges of sharp transitions, named after their discovery by physicist Ernst Mach in the 1860's.
  • Note how the brightness within each step of the gradient does not appear constant. On the right side of each step you will notice it is lighter, whereas on the left it is darker — very similar to the behavior of an unsharp mask. Move your mouse over the plot below to see what is happening:
  • Unsharp masks are wonderful at sharpening images, however too much sharpening can also introduce "halo artifacts."

  3 more annotations...

• 25 Jun 14
  

  Dan Barsum

  photo

• 09 Oct 12
  

  Ady Gould

  An "unsharp mask" is actually used to sharpen an image, contrary to what its name might lead you to believe. Sharpening can help you emphasize texture and detail, and is critical when post-processing most digital images. Unsharp masks are probably the most common type of sharpening, and can be performed with nearly any image editing software (such as Photoshop). An unsharp mask cannot create additional detail, but it can greatly enhance the appearance of detail by increasing small-scale acutance.

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• 20 Sep 12
  

  lee nyeonbok

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• 23 Dec 11
  

  Tommy Heinig

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• 20 Sep 10
  

  res888

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• 06 Aug 10
  

  Danie F

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• 22 Mar 10
  

  Sebastian Di Mateo

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• 18 Jan 10
  

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• 13 Dec 09
  

  matteobonotto

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• 17 Mar 09
  

  laura greaves

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• 26 Jan 09
  

  Marcin Kasperski

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• 22 Jan 09
  

  tutorial photoshop effects unsharpmask mask algorithm sharp

• 08 Dec 08
  

  Frederik Van Zande

  An "unsharp mask" is actually used to sharpen an image, contrary to what its name might lead you to believe. Sharpening can help you emphasize texture and detail, and is critical when post-processing most digital images. Unsharp masks are probably the most common type of sharpening, and can be performed with nearly any image editing software (such as Photoshop). An unsharp mask cannot create additional detail, but it can greatly enhance the appearance of detail by increasing small-scale acutance.

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• 17 Sep 08
  

  Biagio Beatrice

  TecnicheDaSperimentare

• 17 Jun 08
  

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• 02 Apr 08
  

  Graff Greesh

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• 02 Oct 07
  

  Mark Whitaker

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• 18 Jan 07
  

  Marco Piovanelli

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• 25 Oct 06
  

  Thomas Hodder

  photography

• 28 Sep 06
  

  Allen Matheson

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• 12 May 06
  

  pvav pvav

  An "unsharp mask" is actually used to sharpen an image, contrary to what its name might lead you to believe. Sharpening can help you emphasize texture and detail, and is critical when post-processing most digital images. Unsharp masks are probably the mos

  photoshop.tutorials

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