I am trying to make use of featured image on PAGES on my site.
I am basically trying to add a full-width header style to all my posts - so I want to upload images at say 2000x200.
However, Sparkling automatically resizes them to 1140x200.
I can adjust the CSS to ensure that the image appears full width, but it is then of course distorted and not of the quality I uploaded at 2000x200.
What files do I need to edit to stop the 1140 restriction?