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Chapter 7. Working with Adjustment Layer... > Using the Box, Surface, and Shape Bl...

Using the Box, Surface, and Shape Blur Filters

Photoshop introduces three new blur filters (): Box, Surface, and Shape. The Box Blur filter blurs an image based on the average color value of neighboring pixels. Its primary function is in the creation of special effects. You can adjust the size of the area used to calculate the average value for a given pixel; a larger radius results in greater blurring. The Surface Blur filter blurs an image while saving the visible edges; useful for creating special effects or removing that pesky noise or graininess. The Radius option specifies the size of the area sampled for the blur. The Threshold option controls how much the tonal values of neighboring pixels must diverge from the center pixel value before being part of the blur. Pixels with tonal value differences less than the Threshold value are excluded from the blur. The Shape Blur filter uses a specified shape to create the blur. Choose a kernel from the list of custom shape presets, and use the radius slider to adjust its size. You can load different shape libraries by clicking the triangle and choosing from the list. Radius determines the size of the shape; the larger the shape, the greater the blur.


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