Hello Dale,
very nice, the curves are very well smoothed.
I think it could be better for the grasshopper component to scale the curves like Grasshopper is doing 1 pixel = 1 unit. So it will be more simple to put the image under the curves outputted by Vectorize. At the moment there is 72 pt/inch there so a coefficient 2.835.
I must also add Image Thinner to my plugin Nautilus, but it could be also good you have it in your plugin.
Have you some advice in order to smooth the curve. At the moment I have very jaggy curves outputted from image thinner (green lines). Vectorize output is in red.
