Anti-aliasing

In the previous article, we wrote about the implementation of the oil painting style “Kuwahara Filter” in Blender composite. In this composite, it can adjust the blur setting value to correspond to the width of the oil painting brush.

By using an appropriate brush width, you can create the feel of an oil painting. However, there is one problem with this.

Jaggy lines appear on the boundaries of objects in proportion to the brush width. We think this is due to the effect of the filter being linked to the normal of the rendering image. Other conversion filters that don’t take normals into account apply a filter uniformly to the entire image, resulting in a blurry impression, so it’s difficult to decide which is better.

We can see all the connections of the nodes in the composite, but unfortunately we can’t understand how they work. We’ll consider whether there is some kind of anti-aliasing filter or how to retouch the image.