Pixelize with a Brush-Dot-Map

The "script-fu-pixelraster"-function creates a color-averaged Dot-Map with a selected Brush and a matching masked copy of the active layer.

You can select a brush and enter the amount of colums and rows your raster should have.

Works on RGB-layers only.
--------------------------
Update: the No-Undo Version works much faster on large rasters. Since all changes are made to new layers, you actually don´t need the other version.