ArcScan for ArcGIS can vectorize any raster format supported by ArcGIS for Desktop as long as it is represented as a bi-level image. This means that the data is symbolized with two unique colors. The Unique Values or Classify rendering options can be used to separate a raster into two colors.
Most scanned documents consist of two colors that delineate the foreground and background values. Typically, the foreground is represented as a dark color, such as black, and the background is represented as a light color, such as white. However, these colors can be reversed or represented by different values. As long as the two colors possess unique values, ArcScan will support vectorization for the current foreground raster cells.