Hi Patrick, This uses some memory (~ canvas width pixels * canvas height pixels * 8 preview images * 32 bit RGBA), so let's assume 50 MB to 100 MB.
This consumption is independent from the number or type of layers. Matthias On 11/16/2017 08:02 AM, Patrick Dunford wrote: > > So to put it another way this is the reason why Qgis wants to use a > huge amount of memory (40 GB) when I have a lot of raster images > loaded in the background. > > > On 16/11/17 18:56, Tim Sutton wrote: >> Hi >> >>> On 16 Nov 2017, at 04:35, Patrick Dunford <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> What is this "preview job" function? >>> >>> >> >> Its application logic to prefetch / pre-render offscreen content in >> anticipation of user panning the map. >> >> Regards >> >> Tim >>> >>> _______________________________________________ >>> QGIS-Developer mailing list >>> [email protected] <mailto:[email protected]> >>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> >> — >> >> >> >> >> >> >> *Tim Sutton* >> >> *Co-founder:* Kartoza >> *Project chair:* QGIS.org <http://QGIS.org> >> >> Visit http://kartoza.com <http://kartoza.com/> to find out about open >> source: >> >> Desktop GIS programming services >> Geospatial web development >> GIS Training >> Consulting Services >> >> *Skype*: timlinux >> *IRC:* timlinux on #qgis at freenode.net <http://freenode.net> >> > > > > _______________________________________________ > QGIS-Developer mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
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