Instead of painting with colors, paint with an effect. This is great to use if you want to apply a filter to a small area. This engine contains a Filter setting that lets you change what filter to apply. Many of the filters aren’t available to use for this engine, so keep that in mind. You will have to use something like a filter mask to achieve similar results.
A few of the filters that I have found the most interesting are the Motion Blur, HSV/HSL Adjustment, and Unsharp Mask.
You can use a Filter brush to paint on effects. This example uses the HSV/HSL Adjustment as the Filter setting.