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Preview should do the job for you. Open it with that and then do a Save As. Choose the format that you want.
 
I'm confused, I'm working on changing the airport icons that show up in my menu bar, I was told that if I want the color to show up that I need to make them tif files, I did that but not I don't even see the icon in my menu bar, theres just a blank space.
 
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