CorelDRAW Tracing Smoothing Settings Explained

When converting bitmap images into vector graphics using CorelDRAW's PowerTRACE engine, smoothing settings control how the software interprets lines, curves, and angles. Adjusting these parameters allows you to balance path fidelity with node efficiency, eliminating the jagged edges typical of low-resolution raster images. This article explains the primary smoothing controls available in CorelDRAW's trace dialog and how each setting impacts your final vector output.

The Smoothing Slider

The Smoothing slider controls the curvature and curvature continuity of the traced vector outlines.

  • Low Values: Tracing follows the pixel contours of the original bitmap closely. This results in sharper fidelity to the source image, but it can create an excessive number of nodes and wavy, jagged outlines, especially on low-resolution source files.
  • High Values: The engine rounds out irregular edges and simplifies paths by reducing the total number of nodes. This produces clean, organic curves, but setting it too high can cause small features or subtle curves to be flattened or warped.

Corner Smoothness

The Corner Smoothness slider works in tandem with the general Smoothing control to govern how sharp intersections and angles are treated.

  • Low Values: The trace retains sharp, crisp angles and defined points wherever lines meet. This is essential for tracing mechanical drawings, architectural plans, geometric logos, or block typography.
  • High Values: Corners become rounded and softened into continuous arcs. This setting is useful for organic designs, hand-drawn illustrations, or low-resolution artwork where pixelation creates artificial sharp corners that need to be softened.

The Detail Slider (Interaction with Smoothing)

While not labeled strictly as a smoothing control, the Detail slider directly impacts how smoothing functions:

  • The Detail setting dictates how many color boundaries and small elements are converted into vector paths.
  • Increasing detail forces the engine to preserve small artifacts, which can counteract smoothing.
  • Decreasing detail removes minor artifacts beforehand, allowing the Smoothing and Corner Smoothness sliders to generate cleaner, more uniform contours.
  1. Set the Detail First: Adjust the Detail slider until all essential components of the artwork appear without introducing background noise.
  2. Apply Base Smoothing: Gradually increase the main Smoothing slider until wavy outlines straighten into clean vectors while retaining the overall silhouette.
  3. Refine Corners: Adjust Corner Smoothness based on the artwork type—keep it low for text and hard-edged logos, or increase it slightly for organic shapes to eliminate pixel steps.