IMac monitor colour display PROBLEMS

[jnimeck]

Help, my baby got a hold of my keyboard and pressed something and the colour of my monitor is now yellow and all the applications look infared. I have tried recalibrating the monitor display, but it did not do anything to change the strange colour on the montior. Has anyone come across this? I really need to fix this so I can use the computer for photoediting and I am at a loss as to what to do next.
Please help!

 

[Cenobite]

You most likely turned on some display settings meant for visually impaired people.
Open System Preferences and select Universal Access. Make sure "Seeing" is the active tab and check your settings in the Display section. "Back on white" should be checked, "Use grayscale" unchecked and "Enhance contrast" set to normal.

 

[paris38]

Thank you very much Cenobite I'm pretty sure you saved me a good penny I would've taken this to the shop they would've swore something was majorly wrong I thank you so much again!