Question Turn what the camera sees into png

Hey all,
I'm working on a physical card game project and I'm using Unity to make my card design (I know other programs exist for this kind of thing, but I know unity better than I know them and I know how to change out information faster this way. Also I can impliment spreadsheets later for fast card iteration!) the only problem is, I don't know how to take the image I am seeing in Unity and export it as an image. I'm working with a canvas that is of a fixed size (750x1050px) so I at least know what size the final image should be.

I poked around on Google to try and find the answer, but I don't think I'm using the right terminology. I've found a bunch of stuff for going the other way (png to textures) but can't seem to find what I'm looking for here. So Amy help at all would be great!

 

screen capture and encode to png

 

Thanks!!!