9

Despite setting the layer or the symbology of the features to semi-transparent, when performing a selection, the features become solid. I want to edit those features based on properties of the features/background image below them.

How can I set a transparency when features are selected?

2 Answers 2

14

Make selection color transparent by reducing opacity in Set Selection Color window.

Settings menu > Options > Canvas & Legend > Selection color

enter image description here

The same setting is available on a project-specific basis in the Project > Properties menu. You may need to restart QGIS to see the changes.

Here are another few options for making the background visible behind selected features:

Use an outline symbol type:

enter image description here

You can pair this with centroid fill:

enter image description here

Or add multiple, offset outlines for a more filled polygon appearance. The example image below has 6 symbol layers with offsets of 0, 1.5, 3, 4.5, 6, and 7.5 mm.

enter image description here

7
  • Brilliant workarounds! I also managed to get it to be semi-transparent by changing the colour properties themselves under … choose colour... opacity. Commented Jul 4, 2018 at 2:30
  • 1
    Nice! I didn't think to look for transparency in the color selection window. I'll edit my answer to include that info.
    – csk
    Commented Jul 4, 2018 at 16:50
  • I have tried this many times, reducing opacity down to c. 5%, but it doesn't seem to make any difference. Is there anything else I need to change? I am currently on 3.6.3 Noosa
    – JimS-W
    Commented Sep 4, 2020 at 9:24
  • @JimS-W Did you restart QGIS after changing the transparency setting?
    – csk
    Commented Sep 5, 2020 at 14:31
  • 2
    I was having the same issue, @JimS-W - got to Project Properties (Ctrl + Shift + P) and then General. You'll see there where you can change the selection color / transparency. I don't know why the above solution didn't work for me, but I had to change it in the project properties instead of Settings.
    – Will
    Commented May 6, 2022 at 18:00
6

In QGIS 3.10.9, this might not work. Using this path (Settings > Options > Canvas & Legend > Default Map Appearance) to change colors/transparency of selected features will be overridden by the project properties. I successfully changed color and transparency of selected features by going to Project > Properties > General > Selection Color and making my changes there.

1
  • Saved me a lot of time! Commented May 19 at 19:06

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.