The artistic filter are characterised by taking an input, and doing a deformation on them.
Makes the input-image pixely by creating small cells and inputting an avarage color.
Adds random raindrop-deformations to the input-image.
Does semi-posterisation to the input-image, with the 'brush-size' determining the size of the fields.
This filter decreases the amount of colors in an image. It does this per component(channel).
The steps parameter determines how many colors are allowed per component.