file:///C:/Users/FSABooking/AppData/Roaming/.minecraft/screenshots/2016-06-11_14.26.49.png
Here's the link for my world I did
by the way it's not a command you need to get mc edit i'll show you how
go to this link below
http://www.mcedit-unified.net/
And click Windows version bit and download it
After it downloads open it select your world and open it
Pause the game by pressing esc on your keyboard and click world info and add a s symbol with a letter or number here are the colours
e=yellow L=bold 9=black k=magic
and so on search on the web Minecraft colour codes