Where is image stored that I added as Desktop Background?

I thought this would be an easy question.

W/O knowing the name of the image, I cannot search my Mac for it.

I caused this with an accidental keyboard command (probably option-Cmd + ???)

I frequently use option-Cmd + V to paste something I just copied onto my clipboard to keep the format the same in my document.

In this case I must have hit a wrong key which resulted in my making that image my desktop background instead of pasting it into my document.

So the image has no name & I wish to delete it.

I appreciate the attempt to help me with this issue. After so many hours w/o any replies & few views, I got tired of looking at that image as desktop background. So, I manually selected one of my 5K images from my desktop image folder to replace it. 

I do know how to launch script editor.app. (In Application/Utilities folder)

I don’t use Launchpad. I now see it is an alternative way to search for an app.

If I c/p :

“tell application "System Events"

picture of its desktop as text

end tell”

w/o the quote marks

(Not sure about the different color fonts & paragraph indentation for 2nd line)

I don’t know what “the POSIX path” means.

Does it just mean the file path?

Such as “MacintoshHD/Users/name/Documents”

Anyway, if I correctly did as you suggest now, I assume it will tell me the file path to my current desktop image …which I already know.

Probably hopeless for me to find where that other image is lurking.

But, if you know what the exact keyboard shortcut is to click on an image & make that image the desktop background, I can recreate what I had done with a known JPEG  & then search for it by name & where it is copied, I’ll probably find that no name, accidental image as well & I can delete both of them.

Thanks!

I have iMac Retina 5K 27" late 2015 running macOS Sierra v. 10.12.6

I thought that info was supposed to be automatically entered after any post I make.

I don't see it. It used to be automatic.