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I've certainly created something like this; it's a great use for definition queries. Here's a copy/paste/modification from a tool I've written. You'll have to look up how to create a script tool in a toolbox. When you do, make two parameters, one to hold the input shapefile/feature class (type = Feature Class or Layer), and one to enter the "layer by" ...


You could try exporting the whole project with extent and pixel size=resolution set to match the input files: qgis --project myproject.qgs --snapshot image.png --width 1500 --height 1000 --extent xmin,ymin,xmax,ymax cf. http://anitagraser.com/2010/11/30/creating-high-resolution-images-using-qgis/ edit: that's comparable to Project->Save As Image ...

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