Hi Idan, I'll reply for the part I'm aware of.
Le jeu. 1 mars 2018 à 06:05, Idan Miara <i...@miara.com> a écrit : > Hi, > > I was examining the Scale/Magnifier widget in QGIS3. > > I couldn't find any difference in the output picture between the following > combinations (example): > Scale 1:1,000 and magnifier 1000% > Scale 1:10,000 and magnifier 100% > Scale 1:100,000 and magnifier 10% > Is this by design ? > Yes this expected. The idea of the magnifier is for having a "magnifier glass" to do scale-dependent editing. In my scenario, that was useful for fine-placement of labels. But if you don't have scale-dependent rendering (mainly labels I guess) or using map units instead of points for symology, it won't (shouldn't) change anything. > > I was expecting a different results, for instance, if I load OSM, and I > change the magnifier while the scale is fixed I was expecting to see the > same rendered image, just smaller/larger (i.e. same map features, no new > labels/roads etc.) > well, if you magnify with a fixed scale that will change the extent, you can't see as much features in the map. > > Also, is there an option to set the resolution in Map Units per pixel, > i.e.: > Meters Per Pixels (when the units are meters, as in UTM) or > Degrees/Seconds per pixel (when the units are Degrees, as in Geographic) ? > > I guess it makes more sense for most people to use Scale, but when I want > to examine specific pixels of a raster usually it's easier for me to think > in Meters Per Pixels in respect to the Map Units, for instance, when I know > that my map is in 10 Meters per pixel, then if I set the Map canvas > resolution to the same value of 10 Meters per pixel I expect to see the > pixels in 1:1 as one pixel on the raster is one pixel on the map canvas. > > Regards, > Idan. > > Best wishes, Denis
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