So I have a soil map that is currently just an image in my GIS and I want to turn it into a shapefile so that I can manipulate the colors and control each soil category differently. Currently I have just been drawing them in freehand, but this creates a difference between the contours in the soil map and my GIS. It also takes a lot of time. Is there anyway I could at least make sure that the shapefiles I'm making line up exactly with the lines of the contours in the soil map? Again, the soil map is just an image and I need to create a digitized version of it.