Thanks for replying Paul!
However, the problem is inside maya. i see black outline in the texture. Maya rendered image, so i'm seeing it in render view.
1- Make plane,
2- make two texture, one is solid color ramp, the other one is file texture (simple white text in black background made with photoshop)
3- bring layered texture, put white text file onto ramp texture.
4- connect layered texture to lambert material's color channel.
5- assign material to plane.
now render the image, you'll see black edge around the text. the color of black is from text image's background color. so if text's background color is red, you'll see red outline edge.
usually, in compositing package, all i need to do is premultiply the image. but this is in Maya. i don't know what to do...
Any help would be really appriciated !
-kiko