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While I tried to print out 16384px or 8192px maps for satellite and vector maps from QGIS, I found that some vector maps from QuickMap plugin, such as Stamen maps and some ESRI vector maps, cannot be exported properly in very high resolution. It finish the exporting without crash or error, but result png file looks like chequer board or does not print anything at all.

So, I tried to search for more info, and I found this:
https://gis.stackexchange.com/questions ... amen-tiles

Looks like someone already tried similar thing. And then the answers of that question leads me to:
https://anitagraser.com/2014/05/31/a-gu ... m-in-qgis/
http://download.geofabrik.de/index.html
https://github.com/anitagraser/QGIS-res ... spatialite
https://github.com/dpsspatial/Styles/tr ... r/QGIS_OSM

We can download huge OSM data, and import it as a spatialite database into QGIS for target region. Then we can have very high quality road networks, stream networks, and etc.

Following those routes, we may able to get high quality png using OSM vectors from QGIS, and then import image from GIMP, then swap the color using AB palette by color selection, then scale down the image to 2048px to 2048px, and print out as bmp. Or, we can make 2048px version before color swap.

Would this be possible method to get 'looks good' quality of terrain.bmp or pre-terrain.bmp using those OSM data, so that we could reduce the amount of hand work from AB map editor?

It’s definitely doable. I just don’t QGIS like I do Global Mapper, but you can do the same thing.