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Definition: Gaussian blur

A type of image filter commonly used to blur an object. It may be used to blur the entire image or to produce a drop shadow effect. See image filter.

Gaussian Blurred
The Gaussian Blur filter was applied to the original image (top) to produce the one below. (From "Moonlit Gladiolas" by Barbara Postel. Original image courtesy of Pyramid Studios, www.artistexpo.com)

A Drop Shadow
The Gaussian Blur filter is widely used to create a drop shadow effect around text. Using an image editor, a duplicate of the text is made, changed to black and then passed through the filter. The blurred result is aligned under the original text to create the effect.