Finally, the two images are summed. Since convolution is linear, it is legitimate to multiply the values in each image by a constant. Suppose that we multiply the values in the image generated by the unity kernel by a contrast factor, c, (such as 3); multiply the unsharp mask image by -(c - 1 ) (i.e., -2); add the two images; and normalize the image by the sum of the elements in the mask.
This operation produces the same destination image as the mask:
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