Quote:
Originally Posted by iogames
Upload as .PNG and rename as .GIF via FTP  u will keep ur transparencies
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The problem with that is you have to matte a .gif to a specific background color. Therefore, if you display your .gif on background #C0C0C0 on one page, and background #000000 on another, you need two images to achieve an antialiased transparency look.
One specific vBulletin image I can think of is the online/offline indicator - which shows in postbit on one color but in profile view on another color.
The alpha transparency of PNG is what makes them attractive because it will antialias on any background color without matting. A .gif is either colored or transparent - there is no middle ground.