The filters are organized in 3 categories that reflect the formula that generates the outline:

 

1- DUO-DIFF:

2- DUO-DIFF HSL:

3- QUADRA-DIFF:

The Duo-Diff shaders feature an intelligent way to treat the level of details according to the color channels of the source image or its brightness. The Quadra-Diff shaders use another algorythm and will clean out the render according to the basic color dominance (red, green or blue - see the additionnal notes for more information) or the brightness of the source. This lets you have a complete control over the final render.

 

Each category also features an Invisible shader that lets you clear instantly the layer you're working on.

All the shaders are fully customizable. You can adjust lots of parameters and get a very convincing render with any kind of image, such as the image equalization, the paper type, its strength, the fill or the outline strength, etc.

 

There are 11 different papers: Basic, Canvas, Charcoal, Coarse Cotton, Fine Grain, French Watercolor, Hard Laid, Hot Press, Italian Watercolor, Linen Canvas and Retro Fabric. You can decide which paper you use and get very different results even with the same shader. These maps are all seamless and very high res. That way you can work with any size from low res images to extremely high resolution ones (input or output).