u/Complex-Drive5921

In Unity

In drawing application (blue background to make it obvious)

I've seen similar solutions done with shaders, but to my understanding, that would involve making an individual shader for every single sprite in the game, which doesn't seem efficient to me(although I am a novice, perhaps it's the norm). If there was a "one-size-fits-all" solution, where I could have one shader do this to every sprite, that would be perfect.