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GIMP/Pixelize
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thumb|left|An example image of the effect.
thumb|right|An example of the dialogue window of the Pixelize filter. It contains a preview of an image with the pixel size set to 10x10
Pixelize filter is for pixelizing the image, as the name suggests. The only thing you can set there is size of those "pixels". Default value is 10x10.
Gaussian Blur Unsharp Mask