Nuke roto node not showing any colour

[artist-fx]

hi iam new to compositing and roto. i created roto out line for a footage to extract object and when iam trying to comp with  ackground there was nothing in my roto node(in all channels). plz help me 

[artist-fx]

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[glenfx]

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[alphajoe]

I know this is way late and you have probably already figured it out, but when you create a roto node it is only generating an alpha by default.  In the output drop-down, change it to rgba and you will be able to see the color.  In general you don't want to do this, as a roto node is intended to create a mask and you should only be using the alpha anyway.

[alphajoe]

I know this is way late and you have probably already figured it out, but when you create a roto node it is only generating an alpha by default.  In the output drop-down, change it to rgba and you will be able to see the color.  In general you don't want to do this, as a roto node is intended to create a mask and you should only be using the alpha anyway.

As opposed to the rotoPaint node, which defaults to rgba.