How tracing algorithms convert pixels to vector paths — threshold, color quantization, and centerline.
Vector tracing (also called image tracing or vectorization) is the process of converting a raster image (pixels) into vector graphics (mathematical paths). It's how you turn a PNG into an SVG.
How Tracing Works
A tracing algorithm analyzes the pixels in a raster image and identifies regions of similar color. It then traces the boundary of each region to produce a vector path — a mathematical curve that defines the shape's outline. The result is an SVG (or AI/EPS) file containing paths instead of pixels.
Types of Tracing
- Threshold-based — converts to black and white based on brightness, then traces the boundary. Simple and fast
- Color quantization — groups pixels into a limited number of colors, then traces each color region separately. Used for multi-color images
- Centerline tracing — traces the center of lines rather than their outline. Used for line art and hand-drawn sketches
Quality Factors
Tracing quality depends on: source image resolution (higher is better), color complexity (fewer flat colors = better), edge clarity (sharp edges trace better than anti-aliased ones), and the algorithm's settings (threshold, number of colors, path simplification).
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