There are between 20,000 and 30,000 registered screen printing companies in the . and many thousands more worldwide. Additionally, there are thousands of companies that are run from backyards, garages, and storage facilities. All of these screen printing companies have one thing in common—they all use some type of graphics program to create artwork, work with client files, and print out specialty prints and color separations for their film and screens. Many of these artists use some version of Photoshop; unfortunately, there isn’t a single book available on the subject until now!.