Samsung g600 picture quality problems

Just got a new samsung g600 phone and am having real concerns over the quality of the photos when viewing them on the phone when uploaded to a computer the pictures are perfect yet when viewing them on the phone they become all distorted,blurry and full of pixels, this also happens when i bluetooth photos from my other phone nokia 6288, the pictures look horrible.

I think there may be a major fault with my phone.
can anyone help

 

Think I will be sending this phone straight back,
The pictures compressed on the phone screen look terrible probably worst i have ever seen I got 4 year old phones look better.

Strange as pictures look fine loaded up on pc

 

this is due to the picture being squashed as it were to fit the screen it is a real bug bear, you can see the picure full screen and zoom in but the photo has to be in "My Photos" i know it's weird as you can not do this elewhere????