I would like to make a drawing, say, of Marilyn Monroe in black ink, but with red lips. I've figured out how to do this using a jpeg original (by using Photoshop to create two files, one of Marilyn with no lips, and the other of just her lips, and then using "select area/ set frame to area" to make sure the lips are drawn in the correct location), but I would like to do a "TSP" version, and can't figure out how to get the lips properly registered, as when doing vector drawings I usually have to do a lot of image size changes and moving in order to get the image where I want it, and after all the moving, I can't seem to get the lips the right size and in the right location. The "select area" and "set frame to area buttons " don't work with vectors, so I can't use those.

If anyone knows a way to do this, I would appreciate their input. (It may be totally straightforward, but I just haven't figured it out yet!)

Another potential method:

I might be completely wrong about this, it's been a while since I was doing experiments along these lines...but if I remember correctly, the controller draws separate vectors in the order they are listed in the svg file. You can test this out by loading or making a simple drawing in Inkscape, opening Inkscape's xml editor (Edit/XML Editor...), and when you select vectors on the canvas they'll highlight in the xml editor, so you can memorize their order (or you can arrange them into a sensible order in the editor or on the canvas).

If that works (if the controller draws them in the same order), then you can combine your two TSP vectors in Inkscape, and make the lips path first in the xml editor's list (do the lips first since they'll draw quicker than the rest of the drawing). Then you just have to wait until the lips are done being drawn in red, pause the controller, and make the switcheroo.

I think.