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Making coloured areas transparent

Jun 14, 2014, 02:26 (This post was last modified: Jun 14, 2014 13:39 by RhinoCan.)
Post: #1
Making coloured areas transparent
I have an image of a round button that contains white around the outside but also within the button itself; I'd like to make the part surrounding the button transparent while leaving the white question mark on the button itself alone. The image I mean is at this URL:
http://splat.comuv.com/gimp01.html

To be a bit more specific, in the "question" graphic, I want the white question mark in the middle of the button to be unchanged but I want the white part around the outside of the button to be transparent.

What's the best way to accomplish this? I've tried using an eraser but that is rather imprecise. Is there some way to mark the whole area surrounding the button as a single contiguous shape and make all of it transparent WITHOUT reducing the roundness of the button itself? Or is there a better approach?
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Jun 14, 2014, 07:56 (This post was last modified: Jun 14, 2014 08:24 by fluffybunny2.)
Post: #2
RE: Making coloured areas transparent
Have a read here but have you considered just re-making them from scratch?
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Jun 14, 2014, 09:11
Post: #3
RE: Making coloured areas transparent
Re-doing them from scratch is indeed the easy solution.

Now answering your questions on
https://Gimp-Forum.net
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Jun 14, 2014, 16:55
Post: #4
RE: Making coloured areas transparent
You could go color -> color to alpha -> *select color* = Transparent color?
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Jun 15, 2014, 03:49
Post: #5
RE: Making coloured areas transparent
Thank you all for replying, especially you ArtsyArtist. I _knew_ there had to be some simple way to change colour to transparency selectively and you got me on the right path without having to do the whole button again. My problem is now solved to my satisfaction.
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