Logic Ops is a fast simple way to add / subtract / multiply or divide two pictures, usually mattes together

 

 

 

 

 

 

 

 

 

 

 

 

 

Inputs required : 2

 

Swap inputs is handy for subtract or using transparency

 

Clamp Neg button clips negative values

 

Clamp Pos button clips values greater than 1.0

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email me for free shader, flamemark@hotmail.com