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make the white behind 50% opaque color transparent

Jun 26, 2011, 17:21
Post: #1
make the white behind 50% opaque color transparent
as you can see I was able to make the background transparent by 'select by color' + 'add alpha channel' + 'remove selected area' but I also need to remove the white behind the 50% opaque reddish orange flames as well, i cannot select the white by 'select by color' or 'magic wand select' or any of the selection tools because of the issues of the white / reddish orange mix of opacity, so i need help removing this white behind the part opacity color, can someone tell me how to do this?

   
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Jun 26, 2011, 17:31
Post: #2
RE: make the white behind 50% opaque color transparent
Use Colors > Color to alpha, with white as your reference color (i.e. what is white becomes transparent). If there are patches of white you want to keep, make a general selection, then subtract them from the selection (lasso selection while depressing Ctrl).

See also: http://gimpforums.com/thread-changing-a-...parent-png (but with a grain of salt, your case may be a bit different)

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Jun 26, 2011, 19:55
Post: #3
RE: make the white behind 50% opaque color transparent
pressing ctrl isn't working to deselect... I've never had problems with ctrl+select before but apparently it isn't working with a select all function, it doesn't matter what I ctrl+select, it just selects the area i lasso tooled... is this deselect function compatible after a select all function?
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Jun 26, 2011, 20:25
Post: #4
RE: make the white behind 50% opaque color transparent
You're right... so do it the other way.

- Select none
- Select first patch with lasso
- Press shift to select more patches with lasso
- When all are selected, invert the selection (Select/Invert or Ctrl-I)

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Jun 27, 2011, 14:29
Post: #5
RE: make the white behind 50% opaque color transparent
Ye, ofnuts has good ideas / tuts.

Anyways, more simpler tut (but idk will it be good at end), when you select that white background by "select colour" then go to Select > Grow and grow it by ... Idk... try, lets say, hmmm, from 4 to 10 maybe? try all that, i dont have that image so i cant rly see.
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Feb 5, 2013, 12:45
Post: #6
RE: make the white behind 50% opaque color transparent
I know this is old... BUT THIS IS NO LONGER WORKING!!!!!!!! it now is ignoring my selected areas and the color to alpha removes ALL white including the unselected areas!!!!!!!
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Feb 5, 2013, 13:32
Post: #7
RE: make the white behind 50% opaque color transparent
Attach a sample XCF exhibiting the problem: save as XCF just before applying color to Alpha, and if C2A doesn't work correctly, attach the XCF saved above.

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