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Dunno if this is an easy way or if its how its done, But what I do Is do my render with a Black BG and in PS set my background and forground colors to default and Press CTRL I to invert the colors so its like a negative, It then makes my black BG Color White and makes it Transparant when made into a Brush, I then goto Edit and Define Brush. there is a bit more with the preset manager but I find that part hard to explain So maybe someone else can help you there or you could just mess with it as I done...lol
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