Alpha Chanel...
In photoshop, load the original Texture, in your Layers Window switch to the Chanels tab and scroll down you will see a Black and white Immage...
Activate it you will notice that only the plume area is white and everything around it is Black, which transalates as transparent.
So you can select and copy paste that area from the original picture in to your own texture.
If your own texture does not have an Alpha chanel create one just as if you were creating a new layer but under the chanels tab, it should be all White.
Then finally make sure to save your Texture as 32 Bit TGA if your saving in TGA allong with alpha chanel, alternativelly if your working directly on DDS, then save as DXT5 compression.
That should fix it! :)
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