Hi - if you look at the 
Kenney tilemaps / sprites kenney.nl/assets/platformer-art-deluxe they have a blue color as the background -
When I am creating a game, is there a way to make the entire blue background transparent WITHOUT bringing it into an external editing program and selecting it and deleting it?
There are areas inside of elements that require manual selection also, and this could get tedious. I thought the Kenney assets were already transparent? It is a PNG.
Is it something to do with an alpha channel? Thanks! :)