Display an image spanning two monitors or display and image on each monitor

[etrigan63]

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I am using fehwith xsecurelock is a dual monitor set up. I can only get this setup to display an image on one of the two monitors. I can use feh to make a spanning desktop background using --bg-center --no-xinerama on my Xmonad desktop. This does not work when simply displaying an image. I am supposed to use --window-id but I don't know what the values are to manually set them in a script. I am willing to accept displaying a split image (one per monitor) or one image spanned across both monitors. I am not running in Xinerama mode.

[avlec]

The values for --window-id will have to be acquired from some tool like https://linux.die.net/man/1/wmctrl or https://linux.die.net/man/1/xprop