For example, if you set up a four-page project in 2-Up Perfect Bound format and use an 8-page signature, InDesign adds four blank pages to fill out the signature. If you set the signature size to ...

“It has to do with signatures,” he says, which is industry talk for the groups of pages that printers fold and cut to assemble a book. A signature can be as few as four pages or as many as 32 ...