Heavens, I forgot I had that filter. Thanks RobA

Here it is below for anyone wanting it already into a scm.

It's probably better if you avoid using Color to Alpha on the whole image, like Ofnuts suggested. It still won't look that great. The best solution would be to recreate the image on transparent layers using the original underneath as a guide, if you can. Of course, this isn't always possible. When it comes to logos, it's also probably better if you use a vector application in the first place.

why has nobody mentioned a layermask yet ?

I didn't mention it but I do use "quick mask" quite often on a difficult background. I used Layer mask on these pickles to remove the background.

Ha ! I already have that script and didn't get around to trying it and know exactly how it worked.
Just tried it and it does the job perfectly... and so fast ! I set a keyboard shortcut for it.
Thankyou very much for that valuable script RobA that I will use very very often !

Thanks ofnuts and Bug Sampson for info !