Luma Key?

[cassady]

Hi I am new to combustion so sorry if this is obvious.......

I have a B&W rgb image that I want to generate an alpha from. All I want is to output the alpha obtained from the B&W image into a blur node to fake dof on my comp.......

I figure I need to pull a luma key of the B&W footage and output the matte only. The alpha at present is solid white.

Any advice on which keyer to use would be helpful, also how to pass on just the alpha to the next node and not the oringinal rgb info...

Thanks

Anna

[cassady]

Hi I got it using the stencil layer set to luma......guess I was complicating things. I recently changed to combustion from Illusion. It can get alittle frustrating .....I will wait untill I have a real problem to post next!
Anna