Adding a decal to a material in Cycles?

Hey there sorry if this has been asked before but can you add a logo created in photoshop to a character’s shirt in Cycles?

I have the UV setup done just need to know how to stick the decal on in the compositor or can it be done with a png file which uses a alpha channel?

Thanks in advance.

you can add a transparency shader with a mix shader to your original diffuse, add the texture with another mix shader and use the uv as coordinate, and you can use the alpha as the factor in the mix I believe. I will try it out and post a screen grab with a setup if I can get it working right.

Yes, that works well over here too.