Outline Acceleration Bug in PNG to SVG Conversion

[Insua]

Hi,

I've encountered an issue when using vtracer to convert PNG files to SVG. Specifically, during the conversion, the outlines of the PNG are accelerated (or distorted). This behavior seems unintentional and could be a bug.

Steps to Reproduce:
Use a PNG image with clear outlines (e.g., simple shapes or logos).
Run vtracer to convert the PNG to SVG:
vtracer -i input.png -o output.svg
Open the resulting SVG file in any viewer.
Observed Behavior:
The outlines of the PNG in the SVG appear to be faster (accelerated) or distorted, deviating from the original PNG's contours.

Expected Behavior:
The outlines in the generated SVG should match the original PNG without any distortion or acceleration.

[wavygravy2k]

This matches what I'm seeing. Seems to occur when outlines are adjacent to a transparent background, for example.