4.7. Symmetric Nearest Neighbor

4.7. Symmetric Nearest Neighbor
	4. Enhance Filters

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 symmetric pairs

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

Figura 17.43. “Symmetric Nearest neighbor” filter options

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

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

Radius

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

Pairs

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

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