Sorry for the confusing title. I've just had a look at a job I did as it was being run out. To my horror some black type on an light ochre background had the ochre knocked out. That is the black was printing on white. Fortunately it printed OK as the printing gods were happy today. However I want to locate where this problem occurred. I checked the separations in the original Indesign document and they look good. I then checkecd the seps on the pdf's that were sent to the filmakers, in Acrobat, and the seps look good there too. So I know that the cock up has happened at the film setters. I want to talk to them tomorrow to avoid this happening again but I don't know how film makers work with a pdf file. I always thought that a pdf file was to avoid precisely these sorts of problems. If Acrobat is telling me that the magenta and yellow plates have no knockout then how the hell does the platemaker somehow add knockout to the pdf file? Do the platemakers use some sort of software that takes a pdf and reprocesses it before sending it to the filmsetter? Or what. How would others here deal with this problem. Thanks.