[Qgis-user] Print composer not locking layers in 2.18.17 and crashing in 3.4.2

[Patrick Dunford]

I think you are finding that Qgis version 3 handles layers differently 
from its predecessor and has some sort of memory caching of raster 
layers or other capability that uses a lot more memory when processing 
raster layers for display on the map canvas or a print layout, compared 
to previous editions of the software

I have also asked questions like this but so far, I haven't had any 
response to queries about this difference in architecture between the 
versions of the software.

2 GB is a very large raster file by any standard and one might be 
inclined to question a few things like the area that it covers or can 
you downsample or otherwise reduce the size of the rasters to bring them 
within a more manageable size that the software can handle.

On 3/12/18 11:22 PM, Reginald wrote:
> Hello qgis users,
>
> I needed to make a A4 pdf of a parcel with as underground the aerial
> photographs of distinct years.
> <http://osgeo-org.1560.x6.nabble.com/file/t376957/bouwke.png>
> When I used qgis 3.4.2 the application crashed during the proces of making
> the printcomposer.
> The aerial photographs are jp2 files of a size ranging from 2 GB to 90000
> kb. I used the qlrbrowser to add them to the project.
> The memory usage of qgis escalated to 10 GB and more and eventually qgis
> crashed.
> After trying two times more with the same result I decided to use qgis
> 2.18.17.
> With this version of qgis I could compose the print layout but every time I
> wanted to export the composer to pdf  the individual maps that were locked
> were lost and four identical maps are shown.
> <http://osgeo-org.1560.x6.nabble.com/file/t376957/meulebekestraat_bouwke.png>
> For all the maps I have these item properties:
>    <http://osgeo-org.1560.x6.nabble.com/file/t376957/locked_layer.png>
> How can I export the printcomposer so that I obtain 4 different maps in one
> layout?
>
> Regards,
>
>
>
>
> --
> Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-User-f4125267.html
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