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

[Neumann, Andreas]

Hi Matthias, 

Here is more info: 

First, I receive a warning saying: "To create image 28346x22440 requires
about 1908 MB of memory. Proceed?" with an OK / Cancel button. 

Then I press "OK" 

A dialog appears where I can choose where to store the raster file. 

Then a dialog titled "Image export options" appears, where I could do
various settings, like - again selecting the dpi, width and height and I
could "Crop to content". 

I leave all settings as they are by default and press "Save". 

Then the final and blocking error message dialog is: 

"Trying to create image #1 (28346x22440 @ 300dpi) may result in a memory
overflow. Please try a lower resolution or a smaller papersize". 

Then I can only press "OK" and the image isn't exported. 

Thanks for having a look at this, 

Andreas 

On 2017-07-26 14:48, Matthias Kuhn wrote:

> Hi Andreas, 
> 
> can you send us the warning literally (German or English)? 
> 
> I remember an issue report (or gis.se question) about an artificial limit that was formulated like a warning but was indeed preventing from doing an export. Sounds pretty much like what you are experiencing. 
> 
> Matthias 
> On 7/26/17 9:35 AM, Neumann, Andreas wrote: 
> 
>> 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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