[QGIS-Developer] Exporting large GeoTIFF files from print composer

[Neumann, Andreas]

Hi, 

I would like to export a large format QGIS print composer to a GeoTIFF
file. 

Page format is 2.4 x 1.9 m and I would like to export at 300 dpi. It is
for sending to a copy shop to print out for a trade fair in our
province. 

I can successfully export at 270 dpi, but if I go beyond, QGIS tells me
that I may experience a "memory overflow". 

My machine is 64bit (Win 7) and has 16GB of memory. 

Is this an arbitrary artificial threshold value where QGIS refuses to
export? Would it potentially work, if the barrier wouldn't exist? Could
I somehow bypass this barrier? 

Thanks if you have any idea. 

Andreas
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