I am using Kubuntu 16.10 which has Dolphin file Manager having default white background. I want to give a custom image as background as there in the desktop.

  • Right click on Desktop > Folder view settings > Wallpapers
    – M. Becerra
    Feb 2, 2017 at 15:24
  • Sir, it only changes the desktop background not the background of dolphin file manager. @M.Becerra Feb 2, 2017 at 16:44
  • Asking for your help too.. @giaosudau Feb 2, 2017 at 18:07

2 Answers 2


Qt Style Sheets

http://doc.qt.io/qt-5/stylesheet.html :

Qt Style Sheets are a powerful mechanism that allows you to customize the appearance of widgets...


QSS & Dolphin background image

Older from the KDE Forums - How to set a pattern (image) as a wallpaper on Dolphin?: https://forum.kde.org/viewtopic.php?f=17&t=94717

and more:


Making backStyle.qss:

DolphinViewContainer > DolphinView > QAbstractScrollArea {
      background-color: transparent;
      border-image: url('background.png') 0 0 0 0 stretch stretch;

and starting the Dolphin with the command:

dolphin -stylesheet /path/to/myqss/backStyle.qss 

The result: enter image description here


The Dolphin is painting every other line with the alternate background color in the details view mode:

enter image description here

You could change the color but you can't edit the transparency without rebuild of the Dolphin.

Changing the .../src/kitemviews/kitemlistwidget.cpp line 118 from:

const QColor backgroundColor = m_styleOption.palette.color(QPalette::AlternateBase);


const QColor backgroundColor = QColor(0, 0, 0, 20);

About Qt colors: http://doc.qt.io/qt-5/qcolor.html#QColor-2

enter image description here

After rebuild:

enter image description here

  • 1
    Re. "The Dolphin is painting every other line with the alternate background color in the details view mode", if the alternating color is undesirable, the user can open System Settings >Color to get to the Application Color Scheme window. In there, click on the theme currently being used from the list on the left and then choose Edit Scheme near the bottom right. A new window appears titled, for example, Breeze Dark - System Settings. Click on the Colors tab. On the right of Color set:, choose View from the dropdown. ...
    – DK Bose
    Jul 22, 2017 at 11:17
  • 1
    There, set Alternate Background to be the same as Normal Background. Click Save. Use a new name for the theme to avoid altering the original Breeze Dark. Close the window. You'll be returned to the first Applications Color Scheme window. Click on the theme you just "created" and then click on Apply in the lower right corner. Close System Settings. Now when Dolphin is opened, there shouldn't be alternating colors for rows in detailed view. This works in Kubuntu 16.04.2 LTS with kubuntu-backports enabled (Plasma 5.8.7).
    – DK Bose
    Jul 22, 2017 at 11:17
  • ...What if I want to change the color of the alternating lines and not the opacity? What CSS selector would I use for this?
    – btd
    Aug 3, 2019 at 10:34

For quite a while I wanted to make the background of the file area in Dolphin Transparent or Translucent - like the Folder View Widget that I could have on my desktop. Over the years I messed with different ideas and had a little success, but not the look I wanted to go with my translucent panels and window decorations.

This week I finally achieved a completely translucent 'Dolphin'. The Bright Red buttons and selections will not be everybody's choise - but they can all be toned down. The 'Blur Effect' is enabled using GL3.1 in compositing settings in Kubuntu 18.10, but the translucency works and can be adjusted without the blurring using Xrender and in earlier versions of Kubuntu.

Dolphin against a coloured background

Dolphin against a black and white background to show how the blurring enables the white text to be seen

This was achieved very simply using the Kvantum theming engine and Kvantum Theme Manager.

While this is not changing the background image in Dolphin, quite a few of us found this topic whilst trying to make a translucent background in Dolphin - so I hope this helps.

  • Can you share more details> Jun 21, 2019 at 6:35
  • Hi, I just wrote an answer, but this site lost it, so instead, I will add a link to Kvantum, which I should have posted in the original - that might help. store.kde.org/p/1005410
    – RossD
    Jun 23, 2019 at 0:16

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