Josh Tong
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Program Quality and Support Department
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Generally, wide format printing that you describe is designed at half-size but double the resolution.
Last time I checked, most wide format printers wanted 150 dpi/ppi in the files, but I believe there are newer printers that can take a 300 dpi/ppi file.
If you do design the project at half-size, be sure to clearly instruct the printer to enlarge the output @ 200%.
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Make the design 3 m x 1.2 m (or 60 cm x 24 cm, if that seems easier. If
you have to include raster images, ensure that they are of sufficient
resolution to withstand the needed enlargement. Once the document is
complete in InDesign, do the enlargement on export to PDF. If you run
into a size limitation on the export, then include clear instructions
for the banner shop to enlarge it. They'll be able to if you can't.
> We've received a last-minute request for a banner. I'm designing it in InDesign, CS5.5, in the U.S. The banner will be printed in Rwanda. I'm trying to get the design out the door today.
It's a typical scenario to design to some reduced-scale layout, then scale up at the time of output. Billboards get done this way, often to 1/2" : 12" (1:24) scale.
As already noted, make sure your placed bitmap files are appropriate res for the final reproduction scale and that the service bureau knows exactly what's expected of them when they set up your file to print on their equipment.