Inkscape has a number of filters that can applied to an image. The following thumbnail images show Inkscape filter samples for each of the filter categories. The examples were produced by processing the image, shown to the right, with the various filters. These filters are available under the Inkscape Filters menu.
Inkscape Unfiltered Image.
Width = 114 pixels
Height = 116 pixels
Stroke width = 1 pixel
Fill Color (RGBA) = ff0000ff