Re: recover the alpha transparence of pixels

[James Smaby]

This is a little complicated, but bear with me:

1: Desaturate the image (make greyscale while staying in RGB space)
2: Invert the image
3: Copy the image
4: Bring up layers dialogue
5: Add a layer and fill it with red
6: Add a mask to this layer
7: Paste into the mask
8: Apply the mask

That should do it.  If you want to save it as a transparent image
(i.e. kill the background), use .png format as .gif only supports
one alpha bit. Note that not all web browsers support 8 bit alpha
alpha Mozilla and IE do if I recall correctly.

Re: recover the alpha transparence of pixels

[Seth Burgess]

Hi Eric,

This is the problem I solved in the Color To Alpha
filter - it should be in any recent gimp.  Simply
select the background color and go.  Note that your
image will need to have an alpha channel for the
plug-in to run, and it works best with solid color
backgrounds.

Regards,
Seth Burgess
[EMAIL PROTECTED]

--- COUTIER Eric [EMAIL PROTECTED]
wrote:
 Hello,
 
 Here's the problem:
 
 An image in classic format (gif, bmp, ...). In this
 image, a red curve on
 white background. This curve has been drawned with
 antialiasing option. Now,
 added pixels for antialiasing are in progressive
 light red (and not
 transparent). Is there a tip to perfectly transform
 these pixels in
 semi-transparent pixels.
 
 I've tested this solution but it doesn't give not
 good results:
 .Select-by color:select white area
 .select-feather: about 2 pixels
 .edit/cut
 
 Regards. Eric.


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