ChromaticGuidedBlur is a tool that takes a single rough matte and an image to produce a 3 channel RGB ChromaticAlpha.
Taking the concepts from the original image filtering algorithm and applying it to multiple channels means that you can create and image-based ChromAb matte
You can download the tool here!
rs_guidedblur can be found here!
Details on the guided blur image filtering paper can be found here!