Bug report #19500
Layout export - raster divided into tiles, edges evident in pdf/svg
|Affected QGIS version:||3.2.1||Regression?:||Yes|
|Operating System:||Windows 10||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:|
|Crashes QGIS or corrupts data:||No||Copied to github as #:||27328|
When exporting layout to SVG/PDF rasters are split into pieces of which the edges are evident in resulting output (see attached). This does not happen when exporting as raster (vector symbology and text also rasterised) (with pdf export). I remember this happening quite a few years ago and was then fixed. The last QGIS version I have where this doesn't happen is QGIS 2.18.13 Compiled against Qt4.8.5, GDAL/OGR 2.2.1 , GEOS 3.5.0-CAPI-1.9.0, QGIS code revision Bcba0bb9eb, on my old computer running Windows 7 if that helps. Also effects QGIS 3.2.0 and 2.18.22 on Windows 10 at least.
[needs-docs][layouts] Add checkbox to disable raster tiling for PDF/SVG exports
This setting, which is disabled by default and placed into an
"advanced" group on PDF/SFG export, disables the built-in
raster layer tiled rendering. While the tiling is good for
memory usage, it can cause visible "seams" in the rasters
for generated PDF/SVG files.
The setting has a tooltip warning users that disabling the
tiling results in high memory usage during exports.
#6 Updated by Mathieu Pellerin - nIRV almost 2 years ago
For the record, large raster layers exported through layout (or composer prior to 3.X) were always divided into tiles (the max. number of pixel is 4000-something I think). I'm wondering whether the issue has to do with the PDF reader of the author of this issue, which might have been updated and doesn't render as nicely as it used to.