Description

This tool traces an inserted image with polylines. This can be used as a means to vectorize in image, for example to quickly trace the outlines of an inserted image from a silhouette.

Usage

1. Insert the image you want to trace into your drawing if you have not done so already.
2. Select the image and start this tool.
3. Choose the desired options in the dialog:
4. Monochrome: Enabling this option converts the image to monochrome on the fly before tracing. This can yield better results for silhouette type images that are not completely monochrome already. You can also use this option if you are only interested in the outline of an image with a transparent or white background.
5. Alpha Threshold: The maximum alpha (transparency) value of a pixel to be considered white when converting to monochrome. Valid values range from 0 (everything not completely transparent is black) to 255 (everything is white).
6. Brightness Threshold: The maximum brightness of a pixel to be considered black. Valid values range from 0 (everything is black) to 255 (everything is white).
7. Number of colors: Images are reduced in color before tracing. This number indicates the number of colors to be used for the palette. Lower numbers yield less details or less noise and higher numbers more details or noise.
8. You can click the Update button anytime to update a small preview of the image tracing.
9. Click OK to trace the image. The polylines are added on the current layer.