Wolfram Language & System 10.0 (2014)|Legacy Documentation

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gives a blurred version of image.

gives a version of image blurred over pixel radius r.


  • Blur[image] is equivalent to Blur[image,2].
  • Blur works with 2D and 3D images. For multichannel images, it operates separately on each channel.
  • Blur[image,{rrow,rcol}] uses radius in height, and in width.
  • Blur[image,{rslice,rrow,rcol}] uses radius in height, in depth, and in width.
  • Blur also works with Image3D objects.
  • Blur[image] gives an image with the same underlying data type as image, except for images.  »


  • Blur is a filter function typically used for blurring (or smoothing) of an image. It can be used to suppress noise and local pixel variation or as an effect to de-focus an image.
  • Finer control over the amount and shape of blurring to be applied can be obtained using other filter functions such as GaussianFilter and ImageConvolve.
  • The converse of blurring is known as sharpening, which can be performed by functions such as Sharpen and ImageDeconvolve.
Introduced in 2008
| Updated in 2012