Image as plane displaying dark

Hello,

Jumping ahead, from what I’ve researched, this is happening due to Filmic. I’m trying to composite a plane in the background of my render. I want it at full brightness (well, shadeless).

The arrow is pointing to how the image is displaying in the backdrop (which, by the way - why would it ALSO display as a darker image in the thumbnail in the node?? Weird.).

What would be the proper node to adjust the values?