Transfer pictures

Hello, anybody who can help me to get high resolution pictures (18Mp) from my camera to my windows computer then to my iPad?

iTunes seems to reduce the size to approx 1500x1000 pixels, 700kB.

I want to keep the original picture size.

Can anybody confirm IF this is impossible in ITunes?

Can anybody recommend a work around or app, that does it for me. (Willing to spend a few $)

I've installed

IPhoto

IOS is 6.1.3

windows 7

ITunes 11.0.4