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Yeah, it was the blue.. I compared it to images in your previous posts.. here is how it looked like:

and i thought, the blue gradient seems to be very similiar to that, so I guessed the city ;)

Just lucky ;)

Congratulations, @obvious, that was an exemplary research :)

Oh, wow, now when you showed the hidden image, its really unbeliebale that I guessed the exact image.. Damn, I'm goood!

Well done @obvious - that was amazing sleuthing skills. Wow @shaka great idea and can you believe that fast puzzle solving skill! Am I the only one that reads posts and comments? I see you still have guesses that can't read ;)