Hi all Whenever I use a background map like OpenStreetMap on my high-res laptop screen (192 DPI) in QGIS, the labels are tiny. That is "natural" because tiles are made for screens with ~96 DPI where the size of labels is just fine. When I look at OSM tiles in the browser, I can see that the browser displays the tiles scaled ... so even though the tiles do not look super crisp, at least I do not need a magnifying glass to read labels.
A similar problem I have encountered before is when using tiles from WMTS/XYZ in print/PDF output: with higher resolution of print the rendering engine picks very detailed tiles which again may contain very tiny labels. I would like to fix this in QGIS but I am wondering what would be the correct approach. One simple (and wrong?) solution would be to just scale tiles of all tile layers, but I guess if the service displays some raw imagery it would be wasteful to scale them as this unnecessarily would remove details which could be still shown on high res display. Other solution would be to introduce a new flag for WMTS/XYZ layers where users could set native DPI. By default this flag would be disabled, but for services like OSM one could explicitly set their DPI to 96 and get the tiles scaled accordingly. This would need an update of raster block request API as well where we would also need to specify output DPI in addition to output width/height (but that should not be a big deal). This solution could also work nicely with services that provide high-res tiles (using 512x512 for each tile instead of 256x256) - right now QGIS thinks they are 256x256 so instead of a magnifying glass one needs a microscope - you can try it [1]. Setting explicitly DPI of high-res tiles to 192 DPI should also fix also that issue. My only worry is if this setting is not going to be too difficult to use for ordinary users... But maybe a combo box would make the choice easier: "Normal resolution (96 DPI)" / "High resolution (192 DPI)" / "Custom resolution" (with a spin box). Are there any opinions / ideas how to deal with that? Cheers Martin [1] https://tile.osmand.net/hd/{z}/{x}/{y}.png _______________________________________________ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
