Raster Conversion from IDRISI into ArcGISĬurrently with the new release of ArcGIS 10 users can now open IDRISI raster files (*.rst) without having to perform a file conversion. Below I have outlined some of the most common ways to import ArcGIS files into IDRISI for raster image processing. There is a number of ways to convert ArcGIS grid files and shapefiles into IDRISI raster and vector file formats.