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Fidelis
Asked: 2018-03-22 01:44:24 +0800 CST

How can I launch gThumb (version > 3.4.3) with light background colors in menus and browser like before?

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In Ubuntu 16.04 LTS and before, the gThumb application (version 3.4.3) has a light background in its menus, its browser and its dialogues – like white or light grey. So the gThumb application fits nicely with my light Ubuntu desktop and the other applications.

Now since Ubuntu 17.04 or 17.10, and so also with Ubuntu 18.04 LTS beta, the gThumb application (version 3.6.0 in Ubuntu 18.04) has a dark background for all its menus, its browser and its dialogues – like black or dark grey. This breaks the harmony with my Ubuntu desktop and the other applications which all use light backgrounds, since I use a light Ubuntu theme. (Actually I am using Xubuntu but that's not the point here.)

Is there a way to configure gThumb's background color for menus, browser and dialogues? I didn't find any possibility, also not in dconf Editor.

themes gtk colors gtk3 gthumb

2 Answers

  1. Best Answer

    You can run gThumb with your preferred GTK+ theme and its variant (light/dark) by the following command

    GTK_THEME=<Theme-Name>:<Theme-variant> gthumb

    for example

    GTK_THEME=Ambiance:light gthumb

    If you wish to make a change to the gThumb launcher so that it always launches the application with your preferred theme, then follow the steps below.

    1. Copy the correct .desktop file associated to gThumb (it should be called org.gnome.gThumb.desktop or gthumb.desktop or something similar) from /usr/share/applications to ~/.local/share/applications.

    2. Open the copied .desktop file using a text editor.

    3. Look for the Exec= line. Add env GTK_THEME=<Theme-Name>:<Theme-variant> just after Exec= so that it now looks like

      Exec=env GTK_THEME=<Theme-Name>:<Theme-variant> gthumb %U

      for example

      Exec=env GTK_THEME=Ambiance:light gthumb %U

    4. Save the .desktop file.

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  2. If you start your graphical session with a display manager like GDM or LightDM then you can set the GTK theme environment variable in your ~/.xprofile.
    This is automatically picked up by the display manager without the need to modify individual .desktop files for each application.

    The syntax is GTK_THEME=Theme:variation, e.g.:

    File: ~/.xprofile
───────────────────────────────
export GTK_THEME=Adwaita:light

    And then logout/login again. You can then check whether this was correctly set using your terminal:

    > echo $GTK_THEME
Adwaita:light

    More info on the Arch wiki xprofile page.

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