All your setting changes will appear in the Preview without affecting the image until you click on OK. Note that the preview displays only a part of the whole image if the filter is applied to an selection. Don't keep Preview checked if your computer is too slow.

This option is self-understanding:

Slider and input box allow you to set the size of tile surface.

That's ledge, relief of tiles. Value is width of the lit border in pixels.

That's width of the join between tiles.

When set to 1, most of tiles have the same size. With 0 value, size is determined at random and this may lead to shape variation.

By default light comes from the upper left corner (135°). You can change this direction from 0 to 360 (counter clockwise).

Each tile has only one color. So the number of colors is reduced, compared to the original image. Here you can increase the number of colors a little.

This option reduces the stepped aspect that may have borders.

When this option is unchecked, the image drawing can be recognized inside tiles. When checked, the colors inside tiles are averaged into a single color.

This option splits tiles in areas with many colors, and so allows a better color gradation and more details in these areas.

With this option tile surface looks pitted.

When this option is checked, tiles are lit by the foreground color of the toolbox, and shadow is colored by the background color. Joins have the background color.