I've been trying to branch out with Inkscape and have been experimenting with the interpolate extension. One thing I cannot work out is what the difference between the two interpolation methods is. I've looked at various tutorials/'documentation' and the most they say is that they're simply different.
The example on the left uses interpolation method 1, on the right uses interpolation 2. I can see that in method 1, the bottom line seems to map onto only about 90% of the top line. In method 2, the top line smoothly maps to all of the bottom line.
But what are these methods actually specifying? The order that I select the lines makes no difference so I'm unsure what is happening here.



