JDF is the JOB definition format. As such, JDF data do not contain graphic objects such as crop marks or color bars.|
- One way in which those can be added is by putting all these graphic data in a separate set of PDF files, which is what Preps and some other imposition applications do. The workflow picks up that background template and overlays the pages on it. It has been a while since I played around with this. I know that in the beginning there were some issues with handling marks that you want on top of page content and others that should be masked by the pages. I assume that has been fixed. Maybe others can shed some light on this.
- Another way in which marks can be handled is by delegating this task to the workflow. Since a JDF file can tell the workflow everything about the press sheet, the number of colors and the target press, a workflow like Apogee Prepress can automatically select an appropriate set of marks (crop marks, text marks, press registration marks, color bars,..) based on this information. This is typically the way JDF data coming from an MIS system that supports stripping are handled.