One possibility is that the program you've saved the textures from has "helpfully" antialiased the edges of your texture map to some other (e.g. background) color. Photoshop has an annoying tendency to do this in some situations.
Take a close look at the edges of your textures to confirm this possibility OR try insetting your texture coordinates slightly and see if the problem goes away (e.g. use 0.05 and 0.95 instead of 0.0 and 1.0 for texture coordinates).
Take a close look at the edges of your textures to confirm this possibility OR try insetting your texture coordinates slightly and see if the problem goes away (e.g. use 0.05 and 0.95 instead of 0.0 and 1.0 for texture coordinates).