Taking screenshot in PrBoom-Plus

How can i take screen shot of a map like this
http://historic.karthik82.com/images/doom/cct2/2.png
using PrBoom Plus?

I know it's possible to set up screenshot key at options/setup/key bindings. But how to press default key?

// killough 2/22/98: screenshot key
{"key_screenshot",  {&key_screenshot},      {'*'}            ,
 0,MAX_KEY,def_key,ss_keys}, // key to take a screenshot

I know how to take screen shot in prboom, but I don't know how to take a screen shot from that kind of angle and without any HUD or player's hand on the screen. I want to know how to take a screenshot of only the map and nothing else.

zoom in to hide status bar. press screenshot key during weapon switching. also you can use FLY and NOTARGET cheats with 2.5.1.4.test if you want.

Never mind I found a solution to the problem, thanks for your reply though.

Try this quick hack - it's a pair of invisible sprites to replace the pistol and fist. Load it along with the wad you're playing and you'll have two weapon slots for taking screenshots, so long as you're not trying to kill something at the same time.