![]() A designer should never be doing this themselves. Often support for imposition is actually built-into the RIP itself. (2) Imposition (including booklet making, signatures, step-and-repeat, etc.) is a responsibility of your printer. Trapping is print process / technology dependent and the vast majority of what used to be trapped manually or in application programs is now routinely perform when and when appropriate at the RIP (or DFE for digital print devices). (1) Trapping is best done in the RIP as part of the process that also performs color conversions (using ICC color management) and transparency blending. (I have always used 1.5 to make more compact and efficient PDFs.)Ī few “after the fact” comments based on this thread: You would need to ask your printer about the LPI, then multiply it by either 1.5 or 2 to get your PPI. Resolution is not part of the PDF/X spec, but I use 225 PPI for color and grayscale images when printing at a 150 line screen (LPI) for standard offset printing. PDF/X-1a means you flatten and convert color so there is no optimization they are usually not trapped. The settings are meant to be optimized to their equipment. PDF/X-4 requires the printer to trap (this step is optional but desirable), flatten transparency, and convert color. Or one of each if you don't even know who the printer is.PDF/X-1a if you are unsure about the printer.PDF/X-4 is desirable if the printer has the right equipment and knowledge.Also, the PDF/X format was developed by printers-the X stands for "exchange". PDF/X is a variation that has certain requirements that other formats may not have (although InDesign usually fulfills they requirements automatically). For example, if they ask me to impose the magazine, I become suspect of everything they say. The only exception to output spreads would be for a wrap-around cover, but you have to take the spine width into account for perfect bound-and for an center spread for saddle-stitch (perfect-bound has no true center spread).Īs far as output method is concerned, I would ask the printer, but get a feel for their knowledge. The inside bleed will be trimmed off for saddle-stitch, but aids in cross-over alignment the inside bleed will become the grind-off area for perfect-bound mags. Perfect-bound needs to take the grind off area into account.Īs Rob stated, output single pages with bleed.Saddle-stitch (stable bound) needs to take page creep or shingling into account.The reason the printer should handle it is there are issues to be taken into account depending on the bindery method. Be aware of any printer that requires you to do imposition. Imposition: The printer will handle this as Derek said. There are a couple of things to be aware of when printing magazines, but realize (as mentioned) they are the printer's problem, not yours.
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