>>100149677
Windows: snipping tool/clipboard + imagemagick + pngout
GNU+Linux: scrot + imagemagick + pngnq
This is the imagemagick drop shadown bit you probably are interested in: (basically the same for both systems)
C:\Users\PoopE\Port_Apps\ImageMagick\convert.exe poops.png ( +clone -background black -shadow 80x20+0+15 ) +swap -background transparent -layers merge +repage poop.png