Go to your gallery.  At the top, there should be a link to edit your options.  Click the link and once there, you'll see a list of options you can choose to tic your choice of how your gallery images show.

At least that's what I did and now they are no longer resized.  At least not from my computer.
Hope this helps.

I dare you, while there is still time, to have a magnificent obsession. --William Danforth