I am looking for some (preferably free) GIS software that will enable me to export multi-layered world maps (made up of shape-files and kml files and so on) as hi resolution (21,000 pixels wide), single layered tiff, jpeg or other raster format files, so that i can then edit them in photoshop.
I am an artist, and new to GIS. I have recently started running the free Mapwindow program on my computer. This has enabled me to start constructing some of the world maps that I'm looking for, though I cant seem to find a way of exporting them as images from that program.