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Algebraic Merge
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This function performs the algebraic manipulation of a*A + b*B + c = C,
where a, b, and c are constants (positive or negative) that you enter from
a dialog box, and A, B, and C represent respective pixel values in each of
the data buffers. Thus the result ends up in Buffer C from which it is
displayed.
Algebraic Merge Input Box
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Probably the most common use of this function is to do Unsharp Masking. In that case, you would typically
have an image in A, an unsharp mask derived from that image in B and you
would combine them with this function by selecting a positive value for
'a', a negative value for 'b', and zero for 'c.'
The functions SUM and
DARK SUBTRACT are special cases of this function
which have been added to save time for such simple operations.