It's not very hard to create a screenshot of a kdm theme, you just need to know one simple command.
Logout and let KDM load the theme, then go into tty mode (ctrl+alt+F1-6) and login as usually there (the password won't echo...).
Run the command "DISPLAY=:0 import -window root /path/to/the/new/screenshot.png" (tty mode is kinda like a fullscreen konsole.)
Then login to KDE again (press ctrl+alt+F7 to get back to KDM) and view the screenshot, because sometimes it can get corrupted.
You would think that would be easy enough, but for some reason I always get an error saying saying
XLib Connection to ":0.0" refused by server
Xlib No Protocol Specified
import: Unable to open X server ":0"
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It's not very hard to create a screenshot of a kdm theme, you just need to know one simple command. Logout and let KDM load the theme, then go into tty mode (ctrl+alt+F1-6) and login as usually there (the password won't echo...). Run the command "DISPLAY=:0 import -window root /path/to/the/new/screenshot.png" (tty mode is kinda like a fullscreen konsole.) Then login to KDE again (press ctrl+alt+F7 to get back to KDM) and view the screenshot, because sometimes it can get corrupted.
You would think that would be easy enough, but for some reason I always get an error saying saying XLib Connection to ":0.0" refused by server Xlib No Protocol Specified import: Unable to open X server ":0"