4.7. Symmetric Nearest Neighbor

4.7.1. Overview

This filter blurs the image preserving edges. It is very effective in noise reduction maintaining sharp edges.

It works comparing each pixel to its neighboring pixels and to 1 or 2 pairs of symmetric pixels around the center.

4.7. Symmetric Nearest Neighbor - 图1

4 symmetric pairs

4.7.2. Activating the filter

You can find this filter through Filters → Enhance → Symmetric Nearest Neighbor….

4.7.3. Options

Figure 17.43. “Symmetric Nearest neighbor” filter options

“Symmetric Nearest neighbor” filter options

Presets, “Input Type”, Clipping, Blending Options, Preview, Split view

[Note]Note

These options are described in Section 2, “Common Features”.

Radius

Radius, in pixels, of square pixel region. Width and height of this region are radius*2+1:

4.7. Symmetric Nearest Neighbor - 图4

Pairs

You can select 1 or 2 pairs : higher number preserves more acute features.

4.7.4. Example

4.7. Symmetric Nearest Neighbor - 图5

Left: original…………..Right: filter applied