ID Photo in Changi - Instant passport photo

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I've got this strange requirement, that is I need passport photographs while I was at Changi. This is for one of the country visa on arrival requirement and I am not quite sure whether the destination airport would have an instant photo booth.
First thing is try to look in internet. The popular ID Photo (Instant Photo Booth) which is very common in MRT Stations and public malls seems to be a 'missing thing' in internet.
I couldn't find their website as well as their locations. Four Square showed me there is one but when I asked the Customer Service stall @ Changi T2 they stared at me blankly. But the Guardian staff came to my rescue and Yes, There is a ID Photo booth in Changi.

The location in T2 is near the City/MRT Escalator. This is right next to the ATM's (OCBC, DBS) and you can't miss it if you walk there.
Excuse me for the bad quality of the picture as I took it in a rush :)

Understood that there is another booth @ T3 / Terminal 3 near the entrance too. T1 seems to be missing one;