Do you see white edges around your textures you exported from Photoshop due to filtering?
There are a bunch of steps you can take in Photoshop or Gimp to remove these edges... Or you can just use the Master Edge Cleaner!
Master Edge Cleaner extends the color of your image into your transparent pixels, so that you don't get that white edge from the shader's sampling.
Be sure you fully understand the reason you are getting white edges in your textures. There can be several reasons why you might get this.
