Removing noise with Despeckle

Now for the noise removal filters. Strictly speaking, the Despeckle command probably belongs in the Filter ^ Blur submenu. It blurs a selection while at the same time preserving its edges — the idea being that unwanted noise is most noticeable in the continuous regions of an image. In practice, this filter is nearly the exact opposite of the Sharpen Edges filter.

The Despeckle command searches an image for edges using the equivalent of an Unsharp Mask Threshold value of 5. It then ignores the edges in the image and blurs everything else with the force of the Blur More filter, as shown in the upper-left image in Figure 10-41.

Despeckle

Median, 1

Despeckle

Median, 1

Figure 10-41: The effects of the Despeckle filter (upper left) and Median filter. The numbers indicate Median filter Radius values.

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