In the old days, it was often easier, and indeed made sense, to just print the screen. I once set up a system that ate data off of some rather esoteric machines, store it, analyze it, and make a screen of data and a screen with a graph on it. PrtScr. PrtScr. Tape the data and graphs into a note book. Those were the days.
Everyone knows that on Windows, Print Screen no longer prints a screen, but it does capture the screen. But not in any way that easily works or can be used without unnecessary screwing around. In Linux, on the other hand, Print Screen captures the screen and allows you to save the screen as a png file, or, if you hit Alt-Print Screen, you get the focal window. That’s all good.
But check this out: Linux is so much better than Windows on this useful functionality that many of us (and I’m totally guilty of this myself) forgot to wish for more. Like the ability to send the image to a particular piece of software, or to have a wider range of options for file types.
Linux only: Free screenshot manager Shutter provides a really handy upgrade from the built-in GNOME screen grabber, sending your images to editors, auto-thumbnailing, sending to FTP or hosting sites, and doing much more.