Transparenta färger i Gimp.

1. Open your image in the gimp.
	Se till att det är en gif med mode=index.

2. Right click the image and go to LAYERS then ADD ALPHA CHANNEL. You won't 
notice anything happening, but don't be concerned. It basically adds a 
transparent layer at the bottom of your image so when we erase the 
colors.....it's shows the transparent layer. Which of course would show whatever 
was under it on the screen.
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3. Right click on the image again and go to SELECT and then down to BY COLOR. A 
window that is all black opens up. Don't change any of the settings....just use 
the defaults for now.

4. Now click on the color in the image you want to be transparent. These colors 
will now show up outlined.

5. Right click on the image again and go to EDIT and then down to CLEAR. This 
should now erase the outlined color you just picked from the image and the 
"transparent gimp checkerbox" should show through. This is the Gimps way of 
showing you that section is now transparent.
 
5.5  Här kan man fortsätta och göra selektioner (med trollstav eller lasso)
  för att finjustera. Efter ny selektion, gör 5:edit/clear igen.

6. Right click on the image and choose SAVE AS and make sure to save as a GIF 
file if you want the transparency to work on the web.
 (Man kan faktiskt klistra in gif-filen i en jpg-fil och spara som jpg.)

Most of this information was gleened from this webpage: 
http://courses.washington.edu/englhtml/engl481/usegimp.html and of course my 
Gimp Bible and my Essential Gimp books.

Another fun feature that can be used while using the SELECT and BY COLOR ..... 
instead of hitting CLEAR you can FILL W BG COLOR or the other one FILL W FG 
COLOR ........... this allows you to change the colors over the entire image 
instantly for the particular pixel color you choose to start with. Very fast and 
fun once you figure this out.

 

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