Are you outputting this PDF? If not then the Creep and Imposition should be left to the printers.
If you are then how are you preparing this and what program are you using? More details on your workflow are required before I can answer you adequately.
I am outputting this to PDF by creating a PS file.
I am the printer, and have never had a problem with this before, but this edition of the magazine has an image that spans the centre.
The artwork has been created in ID CS6.
Printing to Postscript isn't a recommended workflow. You're better off using the File>Export and choose Print (PDF).
About the imposition and creep - how are you setting these up? What program are you using?
I am using the Print Booklet functionality in Indesign to create my imposed PDF. If I export to PDF then it won't create the printers pairs that I am after. I can go through and manually impose the PDF in Indesign, but then I won't be able to allow for creep and will have to work that out manually for each spread.
Ah right ok - I'm getting your workflow now.
To be honest - InDesigns Print Booklet feature isn't that strong. If you are a printers you should invest in some imposing software - something like Quite Imposing will work with PDFs inside Acrobat http://www.quite.com/imposing/
It has good imposition tools for this sort of thing.
As for your issue and I understand the workflow better now - can you post screen shots of your settings you're using and also of screenshots of what's going wrong.
With the creep set to 3mm there is a white gap between the front and back cover
With the creep set to -3mm the centrefold image overlaps, losing part of the text
I have just tried to impose it, using Quite imposing, which I have installed on a different computer, but although it imposes for saddle stitch without any problems, it doesn't appear to ask me how much creep to allow for.
In Quite Imposing I think that's under "Trim and Shift"
You either have to push the center in or the cover out, there's no other option with creep. You might want to look at Stephen Sterling's IDImposer plugin, which he is offering free until the end of the year: http://forums.adobe.com/message/4820510#4820510
I wasn't sure if creep adjustment just stretched the cover disproportionately by 1 or 2% so that it doesn't have the gap down the middle, and so on for the following pages.
Now I know that all it does is shift the position. I'll leave it on -3 and think that I may squish the centre spread slightly so that I don't lose anything.
Thanks for all your help.
whether it's apogee impose, XMF, dynastrip, preps or the imposition software outlined above, compensating for creep works one of two ways. it either pushes the pages towards the middle (resulting in the centre spread becoming ruined) or by applying a horizontal distortion on the pages, using the centre spread as a reference. the latter avoids the centre-spread issue. regardless, the software should provide the option as to whether to compensate using scale or shift.
typically where the "shift" method is used, any spread with cross-overs should be compensated for prior to imposition. a way of doing this is using something like an excel spreadsheet to work out how much a page on a particular spread will "shift", and then move the artwork on the affected page the other way (or at least, the items that cross the spread only). It's tedious and if the client's artwork changes completely from the first proof, frustrating, but that's the life of a prepress operator
Can you add some inside bleed on the cover spread to compensate for shifting?
IDImposer allows the setting of outer (cover) and inner (center) creep independently, scaling the creep applied to the in between sheets accordingly. Creep shifts the page contents.
Stephen Carlsen, author of IDImposer