Hi @amann078 and welcome to the Community 
I haven't used this camera before,
is it greyed out all the time or when you are connecting to a TV?
Hi there
Forgive me for jumping in here. According to the manual HERE -
You can output still images in 4K resolution by selecting MENU →(Playback) → [4K Still Image PB] → [OK].
Cheers
Not forgiven 
Thanks for stealing my next post which was going to include the manual (after hopefully a response
from the member saying "Its when I connect to the TV"), then I could then ask what specs their TV has because if the TV doesn't meet certain requirements (as I'm sure you know) then the 4k sill image will stay greyed out in the menu 
Ooops - How about a piece of 
to sweeten things up? Everyone likes cake surely?
All else, ill shout you a 
or two
