How do I vectorize a grayscale image, for example, a soil map?
A grayscale image can normally be vectorized using R2V’s Vector/Auto Vectorize command. Sometimes a grayscale image is stored as an 8-bit palette color image (use Image/Information to verify). If this is the case, you need to first convert the image to grayscale using Image/Conversion/8-bit Palette to Grayscale command and then use Vector/Auto Vectorize. If you need to vectorize a certain grayscale range, for example, dark lines for soil boundary drawn on an aerial photo, you can use the Image/Set Image Thresholds command to determine the threshold first, and then use Vector/Auto Vectorize with the option “Use Existing Image Threshold” box checked. You can also draw a selection box first to select a training area for the grayscale range, and then use Vector/Auto Vectorize.
