Newbie Matte Problem

[rasul]

Hello,

I'm new to Nuke and I'm having a small problem getting this simple composite to work. I basically have an RGB image and an alpha image and I'm combining them and then putting them over a constant. For some reasons the matte isn't working entirely and part of the unwanted RGB image is coming through. In the shuffle node, I'm taking the RGB channels from the RGB image and then just using the R channel from the alpha for the alpha channel (I've tried using add-mix and the copy node also but they all end up the same.)

Both the RGB and alpha are 16bit SGI images.

Here's a link to the project if you want to peek inside: http://drop.io/nuketest00x

Any help would be appreciated!

Thanks much.

[rasul]

Ok I guess I need to premultiply the shuffle channel. I'm used to working in AE and we don't have to do things like that.