Trying to alter trimbox dimensions with set page boxes tool

Question

I have an A3 PDF supplied by my customer. All is fine until I want to put it over to my imposition software. Turns out the trimbox of the pdf is not set to A3 landscape. Apparently I can easily change this in the set page boxes window. But I can't. The A3 option is greyed out and when I manually type in the dimensions it tells me I cannot reduce to these dimensions. What am I doing wrong? I have tried taking the pdf into Quark and exporting it as a new pdf but the same thing happens. Any advice welcome. I realise I'm probably missing something obvious but I'm learning on the job with no help!

Luke Jennings3 · Answer

Does the pdf view as portrait or landscape? if portrait, you can rotate the page using the Organize page tool or with a preflight profile (Tools> Print production> Preflight). If it is viewing as landscape, and the page size is 420 x 297, as indicated in the lower left corner, then something odd is happening. What imposition program are you using? Can you show a screen shot of the set page boxes window?

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