[Gimp-user] Transparency

2002-11-07 Thread Volker . That
Hi !

I'm a newbie and have a - for me serious - problem:

I've a nice symbol with blue as background color. Now I want to replace the
blue with transparency. How can I do that easily ?

Thank you for any hint !!

Best regards,

Volker That
Germany


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Re: [Gimp-user] Transparency

2002-11-07 Thread Karl Auer
On Thu, 7 Nov 2002 08:32:50 +0100
[EMAIL PROTECTED] wrote:
 I've a nice symbol with blue as background color. Now I want to replace the
 blue with transparency. How can I do that easily ?

Add an alpha channel first (Image-Alpha-Add alpha channel, or via the Layers 
dialogue). Then use the magic wand (it's tool tip says select contiguous regions) 
and click somewhere on the background to select everything outside the symbol. Then 
use Edit-Cut to remove the background. This will only work if the entire area outside 
the symbol is one colour, though you can change the threshold to select more or less 
by double-clicking on the wand icon.

If you need to select areas inside the symbol as well, use Select-By color instead; 
click on a pixel that is the colour of the background, and everything of that colour 
in the entire image will be selected. Select by colour has a threshold slider too. 
When everything you want is is selected, use Edit-cut to remove it.

Then go read Grokking the Gimp :-)

Regards, K.

--
~~~
Karl Auer ([EMAIL PROTECTED])   +41-43-2660706 (h)
http://www.biplane.com.au/~kauer/  +41- 1-6327531 (w)
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