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 symmetric pairs

4.7.2. Activating the filter

You can find this filter through FiltersEnhanceSymmetric Nearest Neighbor….

4.7.3. Options

Afbeelding 17.37. Symmetric Nearest neighbor filter options

“Symmetric Nearest neighbor” filter options

Presets, Preview, Split view

These options are common to GEGL-based filters. Please refer to Paragraaf 2, “Algemene Eigenschappen”.

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.

Clipping

Het resultaat van dit filter kan groter zijn dan de oorspronkelijke afbeelding. Met de standaardoptie Adjust wordt de grootte van de laag automatisch aangepast wanneer het filter wordt toegepast. Met de optie Clip wordt het resultaat bijgesneden tot de laaggrens.

4.7.4. Example

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