I'm trying to create a TEST map using splattex.. and I have some problem with RGBA channels...
anyone can help me?? what I wrong??
so...
I created with Gimp the splattex.tga 1024x1024 file:

For this test I used:
RED channel for diagonal lines
Green channel for horizontal lines
Blue channel for vertical lines...
I created with Gimp the splatmap.tga 1024x1024 file:

the three squares are in respective RGB channel...
this is the final result:



in the map there are three areas when appear the three correct lines in the textures (in white)... but in the texture there are also black lines... why?? how can I hide black lines??