Post process trace bitmap
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Introduction
The "Post process trace bitmap" extension is an experimental extension. Presently, it is only available as a separate install. See the Notes section at the end of this document for directions on obtaining and installing this extension.
The "Post process trace bitmap" extension moves to distinct Inkscape layers, each collection of regions of the same color or gray tone which were traced by Inkscape's "Trace Bitmap" tool. Additionally, this extension can optionally remove the color fill applied by that tool, optionally add outlines of the regions, and optionally remove from the drawing the original bitmap image which was traced.
Step-by-step usage