Since ArcScan supports two-color raster imagery, the use of foreground and background colors is important. By default, ArcScan will use the foreground color for raster selections, raster cleanup, and vectorization. Typically, the foreground color will represent the raster cells that are to be vectorized. However, there may be cases when you will need to switch the foreground and background raster colors. You switch raster colors by using the Toggle Colors command that is available on the Vectorization Options dialog box.
- Click the Vectorization menu on the ArcScan toolbar.
- Click Options.
- Click Toggle Colors.
- Click OK.
ArcMap automatically determines the foreground color by comparing the number of pixels in each symbol. The symbol with fewer pixels is designated as the foreground color.