[Qgis-user] qgis and Large Format Print

[Pedro Venâncio]

Hi Régis,

I did here some tests with your data, your project and your composer (project_qgismaster_2613cf6.qgs).

I did exports to pdf vector up to 1200dpi (the generated pdf got 99.1MB) without any problems (nor tiling, nor crashes).

Regarding the export to pdf raster, everything worked well up to 500dpi (the generated pdf got 21.1MB). The three times I tried with 600dpi, qgis crashed.

I'm with QGIS master on Xubuntu 12.04, on a 6 years old laptop (Intel Core2 T5500 at 1.66GHz CPU and 2x1GB DDR2 at 533 SDRAM).

The processor was several times at 100% and RAM in export to pdf raster was also close to 100%.



Best regards,
Pedro Venâncio





----- Original Message -----
From: haubourg 

Hi All,
I tried to create a common environnement to help us test and reproduce
thoses crashes. 
Please find a zip  (220Mo) with datas and qgs projects here, complete test
report and screen captures of CPU/Memory state:
https://www.dropbox.com/sh/zg4zidwab83ym0d/VpxPA3euLI/QGIS_CRASH_COMPOSER
<https://www.dropbox.com/sh/zg4zidwab83ym0d/VpxPA3euLI/QGIS_CRASH_COMPOSER>  

here are my firsts conclusions:

- Making a fresh install of latest master with no plugin or setting *do not
often lead to crash (once only for 20-30 exports), since when pdf or image
raster if resolution is > 300 dpi, then printing just.. does nothing except
creating an empty pdf.* 
Two months ago, I had QGis computing several minutes and leading to a crash.
*Something has changed! No crash, but still no usable export *

- PDF Vector export has a 'tiling' issue of raster background. It seems to
consume less ressources than raster printing. 

- image export do warn user if memory usage is high. PDF export should do
the same. BUT, image export warns you, and does nothing.. just like pdf
export. no image is generated 


I would be pleased to have some feedbacks on your platforms and versions..
We reallly need to consolidate exports. Mapping in QGIS is really often
dedicated to export and printing.. We need it stable. 
Régis