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Creating an alpha from a displacement

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Hi all


I'm trying to see if its possible to produce an alpha thats acurate to the displacement Im seeing though a glass object. Ive tried putting the shape that I have used into the luminance channel and then using the same another alpha from the PSD to create the alpha but its not quite working. Close but not close enough.


So just wondering if anybody out there has ever tried this or knows of another better way to do it?





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Need more information. Perhaps some screenshots/diagrams and a bit more explanation of what you have tried as well as what specifically your goal is. 

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