What actually changes.
Changing a JPG file extension does not create a vector. Vector Boy reads the visible shape and rebuilds it as genuine closed paths.
The source is separated into black and white first. Connected black pixels form areas, their outer boundaries and counters are detected, and those contours are translated into closed Bézier paths.
A useful source has
- clear separation between motif and background
- enough resolution for the smallest intended stroke
- even light without reflections across the motif
- no perspective distortion when geometry matters
Step by step.
- Load the source into the Vector Boy canvas.
- Tune black level, contrast and brightness while comparing with the original.
- Remove marks that do not belong to the design.
- Inspect the Vector view and select Pixel precise, Fine or Subpixel contouring.
- Smooth visible stair steps and simplify Bézier paths conservatively.
- Download SVG after checking closed contours and counters.
Important limitation
JPEG edges often contain compression blocks. Set the tonal separation first and smooth only enough to retain the intended form.
Questions before export.
Why do JPG edges look rougher than PNG?
JPEG compression creates small brightness blocks that can appear as contour detail when traced.
Does the white background remain in the SVG?
No. The vector export contains black paths and genuine cut-outs only.