Just chiming in as a qgis-user: the best (imho) open source DTP software is
build with QT: scribus (https://www.scribus.net/). Afaik it does support
most things professional publishers need, such as CMYK workflows, high
quality PDF exports, etc. Might be worth taking a look at, or contacting
the devs about this, as they seem to have solved most of these problems?

Vincent.

On Fri, Feb 17, 2017 at 8:50 AM, Even Rouault <[email protected]>
wrote:

> > Unfortunately this is quite involved. At the moment QGIS is highly
>
> > tied into Qt's painter and printer framework. It's going to be very
>
> > difficult to change this and make a change like using another library
>
> > for exports. I think the most feasible approach would be to get the
>
> > changes we require implemented upstream in Qt itself. It's likely less
>
> > work, and also benefits other Qt projects too.
>
>
>
> The GDAL PDF writer creates PDF "at hand" and is able to create layered
> PDFs :
>
> http://gdal.org/frmt_pdf.html
>
> Currently one raster layer, one "annotation" layer for legend, and several
> vector layers, mostly due to the API constraints of the GDAL API.
>
> I'm not sure how feasible it would be (would require at least renumbering
> PDF objects and merging drawing instructions), but potentially you could
> render several layers into separate PDFs and then merge the PDFs into a
> single layered one
>
>
>
> Even
>
>
>
> --
>
> Spatialys - Geospatial professional services
>
> http://www.spatialys.com
>
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