This mode replaces the lower channel composite value with the upper channel where the luma of the lower channel composite is darker than the luma of the upper channel composite.
Darken differs from Minimum in that uses the luma instead of average. When the content of the adjustment layer is greyscale, the results will be identical.
Where the higher layer is partially transparent, the result is mixed with the lower layer composite in a manner proportional to the amount of transparency.
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