A conversion is performed on vOperand2 so that it has the same type as the source image. The conversion rules are defined by the value of the Conversion property.
Offset being an array of at least 2 values (6 for color images), the result is:
Offset[0] * (Parent image [or vOperand1] - Offset[1]) / (vOperand2 - Offset[1]) + Offset[1]
which is stored in the parent image or vOperand1 if there is no parent.