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I'm trying to export large images from the QGIS 2.16.3 print composer. As far as I can tell, whenever the calculation of dpi and export size exceeds ~1615MB, QGIS will show the message:

"Trying to create image #1( 21239x25360 @ 317dpi ) may result in a memory overflow. Please try a lower resolution or a smaller paper size"

And then not attempt the export. The same limitation appears to be applied when trying to do the export from the command line as well.

Is this a standard limitation, or is it based on system specs? (I have 32GB of system RAM). Is there is a way to override it and make QGIS attempt to output the image?

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    This thread mentions using 64-bit build of QGIS to provide higher export resolution. gis.stackexchange.com/a/153464/35779 – whyzar Nov 28 '16 at 17:34
  • Thanks for that thread. Using 'file QGIS' command on the qgis app reports i'm using 'Mach-0 64-bit executable x86_64', so that shouldn't be the problem. – jamierob Nov 28 '16 at 18:26

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