My iphone 5c screen is black and white, like a filter?

So i was out on a walk and when i got home i suddenly look at my phone and its black and white, everything works but its like it has a filter, my friend told me to go to settings and turn of the "Greycyle" thingy and it was already off, its not inverted colors its just black and white, i just got IOS8 last weekend so maybe its ios8. Please help, i love watching YouTube videos and it's frustrating to see everything in black and white. Also when on Facebook i like a status and i can't tell if i liked it cuz i can't see the color. My phone makes me feel color blind, please somebody help meMy iphone 5c screen is black and white, like a filter

Try tapping the home button 3 times very quickly.

IOS8 has an option to turn your phone black and white so it seems you have accidentally tapped something, they did it for color blind people but it is quite a well hidden feature.

This link explains it and explains how to switch it on:
http://www.idownloadblog.com/2014/06/03/ios-8-grayscale-zoom-accessibility/

Now i understand you need to do the opposite and switch it off but if you follow through those settings then slide the grayscale to off you should see the color come back to your phone.