mini Ipad png/jpg issue
I bought my mini Ipad in April 2013. Up until October, all my pictures I took with the Ipad were in jpg format. Now they are in png format - I have installed IOS 7.0.4, is this what changed it? Is there anyway to change it back? I know I can convert png to jpg in MS Paint and other programs, but they picture on my desktop screen is so small it's hard to work with. like cropping, etc.
iPad, iOS 7.0.4