What I want is to extract proportion of raster inside each of rectangle and save it as JPEG image. Sure, it's easy to do it step by step. I select one polygon, clip the raster ten-times for each raster and then move to another polygon. The procedure is clear but please, is there any way how to make it automatically? I mean always select one polygon, extract it 10 times and then select another one - together make 120 pictures ideally in JPEG and save it to folder.
Maybe I could use Graphical Modeler but I'm not sure how to include the condition i+1 for selecting each polygon separately (something like for cycle). Probably it will be necessary to use Python Console but I'm not familiar with scripting in QGIS so far, so I'll need some hint.