Use Raster Snap On/Off to open or close the raster snap capability.

A raster snap is the placement of an accepted data point at a specific location on the closest raster element of an image.

A raster element is defined as a body or as a stream of contiguous pixels of either the foreground color or the color indices that belong to the active color mask.

Use On/Off to turn on or off the raster snap capability.

When on, entering a data point by using a Vectorize tool (such as Place Element or Continue Element) causes a snap, or a shift of the data point, to the closest raster element in the active image. If there is not a raster element close enough, the data point is entered without a raster snap.