GL_LUMINANCE is for gray scale images. For example if you want to save the 
depth buffer.
Besides you should post a little bit more code. I don't know how much 
experience your have with open scene graph. Maybe you didn't call the frame() 
method of your viewer, the camera is not attached to a node or maybe there is 
just nothing to see in the viewing frustum?
Did you display the camera normaly which means with turned off offscreen 
rendering?

Regards,
Johannes

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=12216#12216





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