Render without background color ....

[jaimedc]

I need the final image of my photoshop render pass without the background, that is, ready to put a background in photoshop and not have to cut the image.
As I do this? Please help .. 

[Ed]

http://blog.keyshot.com/keyshot-alpha-channels-two-tuts-for-transparent-backgrounds/

Ed

[jaimedc]

Gracias, Ed...