I scanned three comicbook covers I liked, at 800 Dpi, than created a blanc canvas in photoshop at the size I wanted the prints, then I copied and paste the entire scan onto that canvas. This way I had the right size for my prints and frame. You need to be carefull in picking out a size, otherwise you' ll deform the artwork. It's standard photopaper, an online printshop in Germany printed them for me.