It used to be that sign companies produced full color printing for only the big corporations like Coca-Cola, IBM, or Xerox (back when they were still a dominant player). This technology was expensive unless it was done in huge volume, especially when companies printed larger format advertising media such as posters or banners or the like.
With the onset of digital press in the 1990’s, however, businesses were able to offer affordable 4CP or 4-color process printing – to smaller corporations and companies. Today, most are able to offer to even Mom & Pop businesses.