Screenshot of SDDM6 Theme

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I am working on a number of SDDM6 themes. The challange I have is; how to make a screenshot of an sddm login screen. I am running openSUSE Tumbleweed.
Anybody any tips or trics ..
TIA,
Arjan

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sddm --test-mode

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@justinz thanks!! This got me way closer. However, it displays my sddm screen in 800x600. Is there a way to increase this to (for example) 1920x1080? It’s an option for /usr/bin/Xephyr, but where can I config that? Any idea?

TIA,
Arjan

PS: here’s the output:

arjan@arjanpc:~> sddm --test-mode
[09:11:34.640] (II) DAEMON: Initializing...
[09:11:34.644] (II) DAEMON: Starting...
[09:11:34.644] (II) DAEMON: Adding new display...
[09:11:34.644] (II) DAEMON: Loaded empty theme configuration
[09:11:34.644] (EE) DAEMON: Failed to open VT master: Permission denied
[09:11:34.644] (II) DAEMON: Xauthority path: "xauth_iCVNUC"
[09:11:34.645] (II) DAEMON: Using VT -1
[09:11:34.645] (II) DAEMON: Display server starting...
[09:11:34.645] (II) DAEMON: Writing cookie to "xauth_iCVNUC"
[09:11:34.645] (II) DAEMON: Running: /usr/bin/Xephyr -br -screen 800x600 -auth xauth_iCVNUC -noreset -displayfd 16
[09:11:34.739] (II) DAEMON: Writing cookie to "xauth_iCVNUC"
[09:11:34.740] (WW) DAEMON: Failed to change owner of the auth file.
[09:11:34.740] (II) DAEMON: Setting default cursor
[09:11:34.759] (II) DAEMON: Running display setup script  "/usr/etc/X11/xdm/Xsetup"
[09:11:34.766] (II) DAEMON: Display server started.
[09:11:34.766] (II) DAEMON: Socket server starting...
[09:11:34.766] (II) DAEMON: Socket server started.
[09:11:34.766] (II) DAEMON: Loading theme configuration from "/usr/share/sddm/themes/CitroenDS-Headlights-SDDM-plasma-6/theme.conf"
[09:11:34.766] (II) DAEMON: Greeter starting...
[09:11:34.767] (II) DAEMON: Greeter started.
[09:11:34.898] (II) DAEMON: Message received from greeter: Connect
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Maybe you can find that information on the SDDM wiki.

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Solved! Use

sddm-greeter-qt6 --test-mode --theme <PATH-TO-THEME>

Thanks for helping me out!!
Cheers,
Arjan

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