Alpha Channel visible using Ray Tracing.
 

Hey, I'm new.

I have a polygon plane with a image map shader on it. I saved the image uncompressed .tga with an alpha channel. I'm rendering through mental ray using ray tracing (because its the only lighting setting that uses the alpha channel of my image map).

I thought it was alpha channel but I checked it in Photoshop and everything seems good. I switched from one rendering software to another and I still get this very transparent alpha channel. How do I get rid of the semi-opaque alpha channel on my image map. Image is attached.

I fixed it! I went to the material shader of the image map and under raytrace options I turn down "Shadow Attenuation" to 0.00.

Alright, I'm still having the same problem with another project. I turn down "Shadow Attenuation" to 0.00 and it still doesn't get rid of the black box. Even through raytracing I still get this polygon plane shadow.

adjust the levels correctly in photoshop.
make shure the whites are pure white

The alpha channel is fine when I bring it into photoshop but I'll try to see if there is any residue white left.

Here is the photo