Below is a workaround I use.
viewnior --fullscreen '/home/user_name/Images/My solid color image which obscures my desktop.png' && sleep 2 && dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1 "org.freedesktop.login1.Manager.Suspend" boolean:true && i3lock -i '/home/user_name/Images/My image I like to look at when my computer wakes up.png' -p default -n
I lock my screen with a keyboard shortcut I created in Xubuntu which I
associated with the above script.
After my computer wakes up I need to exit Viewnior (the image viewer I
am using) so that the the file called, "My solid color image which
obscures my desktop.png" disappears.
I suppose the extra step would not be necessary if someone with some
technical knowledge would explain how to cause i3lock to exit the image
viewer after the computer wakes up.
I use "viewnior --fullscreen" instead of "viewnior -f" because the later
didn't seem to work in a terminal. I suppose this was a result of my
using a French language terminal.
Also, if you need to resize your image because you want it to appear
centered on the screen, there's no need to install GIMP or any other
draw or paint application.
I used Google Drawings to resize "My solid color image which obscures my
desktop.png" to match my screen size which is 1366 x 768 pixels. I went
to File–>Page configuration–>Customize and typed 1366 then 768 and
Then I downloaded "My solid color image which obscures my desktop.png"
to my local drive.
I suppose if the developer(s) of this app were to a detailed explanation
of the abovein a message, say the first five times a new image were used
in i3lock, it would help new users quickly and easily lock their screen
securely and ensure their images were centered on the screen.
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Desktop contents displayed on resume, before lock screen is shown
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