When raster graphics are required, these minimum resolution guidelines should be followed as much as possible.
10 to 35 dpi at 100% scale for long viewing distances (billboards etc.) 100 dpi at 100% scale for medium viewing distances (vehicle graphics, large banners etc.) 150 dpi at 100% scale for short viewing distances (posters, trade show graphics etc.) 300 dpi for interior, close up images.