[QGIS-trac] Re: [Quantum GIS] #3687: Unable to export at dpi > 400

[Quantum GIS]

#3687: Unable to export at dpi > 400
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   Reporter:  bderstine                                  |              Owner:  nobody                          
       Type:  bug                                        |             Status:  new                             
   Priority:  critical: causes crash or data corruption  |          Milestone:  Version 1.7.0                   
  Component:  Printing                                   |            Version:  Trunk                           
   Keywords:                                             |   Platform_version:  Windows 7; Kubuntu 10.10 64 bits
   Platform:  All                                        |           Must_fix:  No                              
Status_info:  1                                          |  
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Changes (by mayeulk):

  * platform_version:  7 => Windows 7; Kubuntu 10.10 64 bits
  * platform:  Windows => All


Comment:

 I successfully created an A4 600 dpi map (11Mb in png, 3 Mb in vector pdf)
 on Kubuntu 10.10 (64 bits).

 However, I tried an A0 at 600 dpi in png, it failed. First I was asked:

 To create image 28086x19866 requires about 1673 MB of memory. Proceed?

 I clicked yes (my PC has 4GB of RAM). Then there was the message:

 Creation of image with 28086x19866 pixels failed. Export aborted.

 No crash for me however. My test dataset is pure vector: OSM data for
 Milano and surrounding, stored on postgis thanks to  osm2postgresql, using
 rule-based render.

 I was able to export the above in A0 but in vector pdf (20 Mega bytes). If
 you can export in vector pdf, you can convert later on in raster, as a
 workaround (for instance, gimp does this, but command line solutions might
 be less memory hungry).

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Ticket URL: <http://trac.osgeo.org/qgis/ticket/3687#comment:2>
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