How can I fix Print Composer errors due to huge file size?

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I have put together a map using the British OS Strategi data set which is pretty densely detailed. It is surveyed at 1:250,000 and so contains roads down to track level, rivers, villages, railway lines - you name it. There's a lot of data.

When I try and export an image version of the map (at about 1m x 1m), I always get an 'Exception: bad allocation' error. This happens when I try to export as a raster image or PDF. I have tried printing to a PDF generator (CutePDF) but the same thing happens. The print spooler shows the file size at 1.6Gb.

I am running QGIS on a dual core 2ghz Windows 8 system with 4Gb of RAM. Is it just a case of the file being too big? Is there anything I can do? Or is there an alternative, free GIS package that would do a similar job?



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