Basically, raster file is a scanned file. You can’t use raster images properly for lack of higher quality. So it needs to convert to vector file. This service convert BMP, CALS, GIF, IMG, JPEG, PCX, PDF, PNG and TIFF format files into higher quality fully scalable  vectors file for use on banners, vehicle wraps, t-shirts, business cards, screen-printing, architectural lettering, signage, cut vinyl and CAD/routers. Following image shows sample of raster to vector conversion

raster-to-vector