How to turn AI-generated linework into a smooth SVG

01

Gate the raster before tracing

Do not send every generated image to tracing. The source image must show a complete, unambiguous outer silhouette around each object. The border should target three times the detail-line weight and must not fall below 2.25 times it.

Reject the image before vectorization when the border disappears at an arch, merges into internal detail, changes weight abruptly, or leaves the object open.

• — Continuous outer silhouette
• — Border target 3x detail weight
• — Absolute minimum 2.25x
• — No missing outline at curves or occlusions

02

Use structural nodes and smooth curves

Trace the visual structure rather than the pixel edge. Fit straight runs as straight line segments between intentional nodes. Fit arches and organic transitions as smooth Bezier curves with aligned handles and as few nodes as the geometry allows.

Adjacent segments that represent one continuous edge must share a node. Parallel outlines should preserve spacing instead of independently following raster noise.

03

Build and verify the border separately

Generate the outer border with the same straight-segment and smooth-curve method used for internal detail, but keep it as its own closed path. A thickened copy of a jagged trace is still jagged and fails the gate.

Check for closure, duplicate segments, spikes, self-intersections, abrupt tangent changes, and visible wobble at normal viewing scale.

04

Apply the 99.5% release gate

Compare the SVG against the approved source and calculate the structural fit across silhouettes, major axes, wheel or opening geometry, and internal detail. Do not release below 99.5%. Inspect arches and long straight runs manually even after the numerical gate passes.