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About Blur & Sharpen effectsIn general, blur effects sample the area around a pixel and assign to the pixel a new value that is the average of the sampled values. Increased blurriness is the result of increasing the size of the sample, whether the size is expressed as a radius or a length. Some blur effects have a Repeat Edge Pixels option. Select this option to make the blur algorithm operate as if the pixel values beyond the edge of the layer are the same as the values of the edge pixels. This option keeps edges sharp, preventing them from darkening and becoming more transparent—the result of being averaged with a lot of zeroes. Deselect this option to make the blur algorithm operate as if the pixel values beyond the edge of the layer are zero. Note: Film grain and noise are removed from an image
when you blur it. To make the image look more realistic, you may
want to add noise back to the image so that it doesn’t look retouched.
(See Noise & Grain effects.)
Stu Maschwitz compares the Box Blur, Fast Blur, and Gaussian Blur effects in a post on his ProLost blog. The RE:Vision Effects SmoothKit plug-in suite contains blurring effects. For information, see the RE:Vision Effects website.
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