This mode multiplies the content of the higher layer against the lower layers.
The channels are treated as a value of 0 where they are zero; .5 where they are 32768, and 1 where they are 65535. The result is unchanged where the upper layer is white; half intensity where the upper layer channels are all 32768 (.5), and black where the upper channels are zero.
One way to think about this is that anything but pure white will make the layer composite darker.
See also: Divide blend mode
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