Once a documment is through the dektop publishing part of production (prepress), the number of copies needed determines whether it is done in-house or by a professional printer. The cost of ink-jet is far too expensive for anthing more than just a few copies. Even a color laser printer is too expensive if more than a 100 copies are needed.
The first thing a printer will do is make the piece camera ready. The term camera-ready was first used in the photo offset printing process, where the final layout of a document was attached to a "mechanical" or "paste up." Then, a stat camera was used to photograph the mechanical, and the final offset printing plates were created from the camera's negatives.
In this system, a final paste-up that needed no further changes or additions was ready to be photographed by the process camera and subsequently printed. This final document was called camera-ready.
In recent years, the use of paste-ups have been replaced by desktop publishing software, which allows users to create entire document layouts on the computer. In the meantime, many printers now use technology to take these digital files and create printing plates from them without use of a camera and negative. Despite this, the term camera-ready continues to be used to signify that a document is ready to be made into a printing plate. In this new digital-to-plate system, a digital file is usually considered camera-ready if it meets certain conditions.