4.7. Symmetric Nearest Neighbor

4.7. Symmetric Nearest Neighbor
	4. Filtres d’amélioration

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….

Figure 17.35. « Symmetric Nearest neighbor » filter options

Presets, Preview, Split view

These options are common to GEGL-based filters. Please refer to Section 2, « Options communes ».

Rayon

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