Mainland European nations developed screen printing for outdoor flags and banners more industriously than other markets and have embraced digital fabric printing technology because of its ability to turn a profit on lower volume print runs, according to Brook International, a supplier of fabrics to flag makers and digital printers. New digital printing machines caught on first with small operations (one-to-three person staff operating one or two machines) and made inroads with high-volume screen printers who wanted a slice of the modest-volume markets. Research and development among digital printer and ink manufacturers keep increasing the color quality and resolution of digital printing, making it even more appealing. A wider (and more environmentally friendly) range of substrates can be digitally printed, also cutting into the market for PVC substrates, the screen printing standard.