When I create a PDF file with QGis and open it in Adobe Illustrator, I cannot select the polygons one by one but only all together... See picture below With a PDF exported with another GIS software, in Adobe Illustrator, I can select the polygons one by one (so a publishing compagny can change the colors of each polygons)... See picture below Is there a way to export PDF with QGis in order to be able to select the polygons one by one with Adobe Illustrator (or other publishing software...) ?
The paths are grouped in the PDF. You just need to "ungroup" them in Illustrator. Select the group, then right click and from the popup menu choose "Ungroup". You may need to do this a few times if the objects are inside nested groups, but eventually you'll be able to select them individually.
Alternatively, in Illustrator you can double-click a group to "isolate" it and work within that group. You would then be able to individually select members of the group (note that again, if groups are nested you may need to keep double-clicking until you enter the appropriate child group).