Transparent bucket fill won't work

[Holographic Breathing]

For some reason,  when I tried to make the background transparent, it doesn't work.
Here is a video of me trying and not succeeding.
It would be great if someone can tell me how to make this work.
Thank you for any advice in advance.

https://youtu.be/cSAzhJlv7lI

[rich2005]

That looks like Gimp 3 to me - is it ? This next is much the same in Gimp 2.10

Some of your concepts are wrong.
Transparency comes from an alpha-channel. You add one from Layer -> Transparency -> Add Alpha Channel. If that is greyed out then the alpha channel already exists.

Removing a plain background can be done is several ways. For your image:
Colours -> Colour-to-Alpha The colour to remove is set as white, no need to change anything. If another colour then there is a colour picker to use. The colours in the image are light and they get a bit removed as well, become semi-transparent. Use the Opacity Threshold slider to restore. In Gimp 3 that is a layer effect (fx) so tick the merge option.

60 second example: https://i.imgur.com/qg2DP7J.mp4

Saving / exporting. Save your work as a Gimp .xcf which keeps layers, transparency ... Exporting - Not all formats support transparency. Use .png or maybe tiff. A jpeg does not support transparency and replaces that with the current background colour.

[Holographic Breathing]

(08-01-2025, 09:53 AM)rich2005 Wrote: That looks like Gimp 3 to me - is it ?  This next is much the same in Gimp 2.10

Some of your concepts are wrong.
Transparency comes from an alpha-channel. You add one from Layer -> Transparency -> Add Alpha Channel. If that is greyed out then the alpha channel already exists.

Removing a plain background can be done is several ways. For your image:
Colours -> Colour-to-Alpha   The colour to remove is set as white, no need to change anything. If another colour then there is a colour picker to use.   The colours in the image are light and they get a bit removed as well, become semi-transparent. Use the Opacity Threshold slider to restore.  In Gimp 3 that is a layer effect (fx) so tick the merge option.

60 second example: https://i.imgur.com/qg2DP7J.mp4

Saving / exporting.  Save your work as a Gimp .xcf which keeps layers, transparency ...  Exporting - Not all formats support transparency. Use .png or maybe tiff.  A jpeg does not support transparency and replaces that with the current background colour.

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Yes, it is Gimp 3
Thank you for your video.
that works well.
I don't understand why sometimes it works with the bucket fill and other times not