Layers Dialog / Layer Blending Modes / Traditional Blend Modes

§ 19.6.1.4 - Add Grey

This mode adds the content of the higher layer to the lower layers. Each channel of the upper layer is treated as zero where it is middle grey (32768), -1 at 32767, 1 at 32769 and so forth.

Where the higher layer is partially transparent, the sum is mixed with the lower layer composite in a manner proportional to the amount of transparency.


Add Grey blend mode
You can see that where the Dancer image is dark, it darkens the layer below, and where it is light, it brightens the layer below.
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