Plugin Request for wallpaper site

Looking to build my first site and decided on a wallpaper site (I know they are dime a dozen nowadays). From my initial impression, it looks like all the themes or plugin available today either just do a single upload with autopost or bulk upload with autopost. All of them create multiple files for each resolution specified. So if I want to support 25 screen sizes, I would have to keep 25 copies of the wallpaper on my hosting server which is a no-go.

Is there a plugin or theme which would convert the wallpaper on the fly? If not, is it possible to develop it? How much time would it take for the conversion? Any thoughts on this are much appreciated.