The trace is only as good as its edges.
Wobbly outlines almost always mean the source had wobbly edges you could not see.
A tracer follows edges exactly — including the ones compression invented
JPEG discards detail in 8×8 blocks, and around any hard boundary it leaves faint rings and speckles. At 100% zoom you will never notice them. An edge detector notices nothing else: it follows those artefacts as faithfully as it follows your artwork, which is why a JPEG logo comes back with rippled outlines and stray fragments floating near the edges that a PNG of the same design would not produce. Low resolution compounds it — at 200px a curve is a staircase of pixels, and the tracer returns the staircase, correctly. The tracer is not guessing badly; it is reading precisely what is there.
How to confirm it
- Zoom the source to 400%
- Look at any hard edge. Rings, halos or speckles mean JPEG artefacts.
- Check the pixel dimensions
- Under ~512px on the short edge, the trace inherits visible stair-stepping.
- Look for stray fragments
- Tiny disconnected shapes near edges are compression noise, not artwork.
- Try a different source
- If a PNG of the same artwork traces cleanly, compression was the cause.
- Rule out the wrong fix
- Upscaling AFTER tracing does nothing — the paths are already wrong.
The fix
Any other copy — a PNG, the original design file, a larger export — beats re-tracing the JPEG.
Scale the raster up before tracing. Artefacts stay the same physical size while the shapes grow past them.
Clean flat art returns tens to a couple of hundred paths. Thousands means it is still tracing noise.
Fix it here.
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FAQ
Not meaningfully. Every tracer follows boundaries, and the boundaries in a compressed low-resolution image are genuinely ragged. Some smooth more aggressively, which trades wobble for softness and loses real detail along with the noise. Improving the source beats changing the tool every time.
Before tracing, the artefacts stay the same absolute size while the shapes get larger, so they matter proportionally less to the edge detector. After tracing, the paths already encode the wobble — scaling just makes the wobble bigger.
Occasionally, for flat high-contrast artwork captured at high zoom on a high-DPI screen. Usually not: a screenshot is a re-render of something that already existed, often scaled, often compressed, and usually with a background baked in.
Then tracing is the wrong tool rather than a poorly-performing one. Photographs have gradients rather than edges, so any trace returns a poster-like reduction. That can be a great result deliberately and is never a faithful reproduction.